The document discusses work, energy, and the conservation of mechanical energy. It defines work as the product of force and displacement, and introduces kinetic energy as the energy of motion and potential energy as stored energy due to position or force interactions. The document also explains that the total mechanical energy, which is the sum of an object's kinetic and potential energies, remains constant in an isolated system according to the law of conservation of energy.
This document discusses work, energy, and the conservation of mechanical energy. It defines work as the product of force and displacement, with units of joules. Kinetic energy depends on an object's mass and speed, and potential energy includes gravitational potential energy and elastic potential energy. The principle of conservation of mechanical energy states that the total mechanical energy of an isolated system remains constant over time. Examples are provided to demonstrate calculations of work, kinetic energy, potential energy, and applying the conservation of mechanical energy to solve for unknown values.
Karen Adelan presented on the topic of classical mechanics and energy. Some key points:
- Energy is a conserved quantity that can change forms but is never created or destroyed. It is useful for describing motion when Newton's laws are difficult to apply.
- Kinetic energy is the energy of motion and depends on an object's mass and speed. The work-kinetic energy theorem states that the net work done on an object equals the change in its kinetic energy.
- Potential energy is the energy an object possesses due to its position or state. The work done by a constant force equals the product of force, displacement, and the cosine of the angle between them.
The document discusses energy, work, and power, defining these concepts and how they relate. It explains that energy can be converted from one form to another but is never created or destroyed according to the law of conservation of energy. Assessment tasks are provided to evaluate understanding of energy transfer and transformation within closed systems.
Chapter 6 - Giancoli - Work and Energyconquerer742
This document provides an overview of work, energy, and potential energy concepts from a physics textbook chapter. It defines key terms like kinetic energy, potential energy, conservative forces, and introduces the work-energy theorem. Examples of calculating work done by gravity and changes in kinetic and potential energy are presented. The history of Joule's experiment demonstrating the equivalence between work, heat, and energy transfer is briefly described.
The document discusses different types of work including work against inertia when accelerating an object, work against gravity when lifting an object, and work against friction. It provides examples such as throwing a ball or pushing a box and explains concepts such as mechanical energy, the work-energy theorem, and conservative versus non-conservative forces. Formulas are given for work as well as the definition of joules as the SI unit of energy.
The document discusses work, energy, and power. It defines key terms like work, force, kinetic energy, potential energy, and mechanical, heat, chemical, electrical, and nuclear energy. It provides examples of calculating work done and energy for objects in motion. The document also defines the unit of power as watts and provides examples of calculating power from scenarios involving work over time. It discusses different forms of energy like heat, internal, and nuclear energy and introduces the mass-energy equivalence relation E=mc2.
The work-energy theorem states that the net work done on an object by external forces is equal to the change in the object's kinetic and potential energy. It can be applied in three cases:
1) For horizontal motion, the work done by the net force is equal to the change in kinetic energy.
2) For vertical motion under gravity, the work done by gravity is equal to the negative change in potential energy.
3) In general, the work done by non-conservative forces is equal to the change in total mechanical energy, which is the sum of the changes in kinetic and potential energy.
If the net work done by non-conservative forces is zero, then the total
The document discusses various concepts related to work, energy and power including:
- Energy is the ability to do work and can take different forms like kinetic, potential, etc.
- Work is the transfer of energy due to a force over a distance. It is related to energy by work-energy theorems.
- Potential energy is the stored energy an object has due to its position or state. Gravitational and spring potential energy are discussed.
- The principle of conservation of energy states that the total energy in an isolated system remains constant.
This document discusses work, energy, and the conservation of mechanical energy. It defines work as the product of force and displacement, with units of joules. Kinetic energy depends on an object's mass and speed, and potential energy includes gravitational potential energy and elastic potential energy. The principle of conservation of mechanical energy states that the total mechanical energy of an isolated system remains constant over time. Examples are provided to demonstrate calculations of work, kinetic energy, potential energy, and applying the conservation of mechanical energy to solve for unknown values.
Karen Adelan presented on the topic of classical mechanics and energy. Some key points:
- Energy is a conserved quantity that can change forms but is never created or destroyed. It is useful for describing motion when Newton's laws are difficult to apply.
- Kinetic energy is the energy of motion and depends on an object's mass and speed. The work-kinetic energy theorem states that the net work done on an object equals the change in its kinetic energy.
- Potential energy is the energy an object possesses due to its position or state. The work done by a constant force equals the product of force, displacement, and the cosine of the angle between them.
The document discusses energy, work, and power, defining these concepts and how they relate. It explains that energy can be converted from one form to another but is never created or destroyed according to the law of conservation of energy. Assessment tasks are provided to evaluate understanding of energy transfer and transformation within closed systems.
Chapter 6 - Giancoli - Work and Energyconquerer742
This document provides an overview of work, energy, and potential energy concepts from a physics textbook chapter. It defines key terms like kinetic energy, potential energy, conservative forces, and introduces the work-energy theorem. Examples of calculating work done by gravity and changes in kinetic and potential energy are presented. The history of Joule's experiment demonstrating the equivalence between work, heat, and energy transfer is briefly described.
The document discusses different types of work including work against inertia when accelerating an object, work against gravity when lifting an object, and work against friction. It provides examples such as throwing a ball or pushing a box and explains concepts such as mechanical energy, the work-energy theorem, and conservative versus non-conservative forces. Formulas are given for work as well as the definition of joules as the SI unit of energy.
The document discusses work, energy, and power. It defines key terms like work, force, kinetic energy, potential energy, and mechanical, heat, chemical, electrical, and nuclear energy. It provides examples of calculating work done and energy for objects in motion. The document also defines the unit of power as watts and provides examples of calculating power from scenarios involving work over time. It discusses different forms of energy like heat, internal, and nuclear energy and introduces the mass-energy equivalence relation E=mc2.
The work-energy theorem states that the net work done on an object by external forces is equal to the change in the object's kinetic and potential energy. It can be applied in three cases:
1) For horizontal motion, the work done by the net force is equal to the change in kinetic energy.
2) For vertical motion under gravity, the work done by gravity is equal to the negative change in potential energy.
3) In general, the work done by non-conservative forces is equal to the change in total mechanical energy, which is the sum of the changes in kinetic and potential energy.
If the net work done by non-conservative forces is zero, then the total
The document discusses various concepts related to work, energy and power including:
- Energy is the ability to do work and can take different forms like kinetic, potential, etc.
- Work is the transfer of energy due to a force over a distance. It is related to energy by work-energy theorems.
- Potential energy is the stored energy an object has due to its position or state. Gravitational and spring potential energy are discussed.
- The principle of conservation of energy states that the total energy in an isolated system remains constant.
I do not have enough information to fully answer the questions. The passage provides the kinetic energy and heights of points A and B, but does not give the mass of the block, which is needed to calculate kinetic energy at B using the work-energy theorem. It also does not provide the distance or time of travel between B and C, which would be needed to calculate the work done by friction during the BC segment.
The document summarizes key concepts relating to work, power, efficiency, and energy flow. It defines work as the transfer of energy through motion requiring a force over a distance. Power is the rate at which work is done or energy is used. Efficiency refers to the ratio of useful energy output to the total energy input. Energy flow diagrams can be used to trace the storage, conversion, transmission and output of energy through a system, identifying losses at each step.
Work, Power & Energy for Class X CBSE and ICSEKeyurMaradiya
Work is defined as the product of the force applied and the displacement in the direction of the force. Work can be positive, negative, or zero depending on the angle between the force and displacement vectors. The SI unit of work is the joule.
Power is defined as the rate of doing work, or the amount of work done per unit time. The SI unit of power is the watt.
Energy is the ability to do work and exists in various forms including kinetic energy, potential energy, and mechanical energy. The law of conservation of energy states that the total energy in an isolated system remains constant. It can be transformed from one form to another but cannot be created or destroyed.
The document discusses the work-energy theorem and how it relates to changes in kinetic energy, potential energy, and thermal energy. It provides examples of calculating work done to change an object's speed and examples of calculating thermal energy generated from friction. The final section lists three example problems involving calculating initial or final velocities given information about work done and masses of objects.
- This chapter discusses work, energy, and power. It explains the relationships between these concepts and covers energy changes and mechanical efficiency.
- Students will learn to define and calculate work, energy, and power using formulas like kinetic energy (Ek = 1/2mv2), gravitational potential energy (Ep = mgh), and power (P = W/t). They will also learn about the conservation of energy and conversions between different energy forms.
- Examples are provided to demonstrate calculating speed, work, efficiency, and more by applying the relevant formulas to mechanical systems and problems.
A simple ppt yet interactive on the topic work power and energy. With smooth design and looks the ppt is very good for clearing the basics related to this topic, hope it will help you further.
Potential energy is energy stored in an object due to its position or state. There are different types of potential energy including gravitational potential energy, which is the energy an object gains when lifted against the force of gravity. Gravitational potential energy is calculated as the product of mass, acceleration due to gravity, and height. Kinetic energy is the energy of motion an object has due to its mass and velocity. As an object gains potential energy, it loses kinetic energy and vice versa.
1) Chapter 6 discusses work, energy, and power, defining kinetic energy as the energy of motion and potential energy as energy associated with positional forces.
2) The work-energy principle states that the net work done on an object equals its change in kinetic energy. For conservative forces only, the total mechanical energy is conserved.
3) Power is defined as the rate at which work is done or energy is transferred. Units of power include watts and horsepower.
1) In an elastic collision between two bodies in one dimension, both linear momentum and kinetic energy are conserved.
2) By applying the laws of conservation of momentum and kinetic energy, equations relating the velocities of the bodies before and after collision can be derived.
3) These equations allow calculating the unknown velocities if the masses of the bodies and their velocities before collision are known.
Explain work, energy and power. The Law of Conservation of Energy is utilized as well as conservative and non conservative systems.
**More good stuff available at:
www.wsautter.com
and
http://www.youtube.com/results?search_query=wnsautter&aq=f
Power Point Presentation ''Work Power Energy" Arun Murali
1) Work is done when a force causes an object to move through a distance. It is calculated as work = force x distance.
2) There are different types of energy including kinetic energy from motion, potential energy that is stored, and many others.
3) The law of conservation of energy states that the total energy in an isolated system remains constant, although it can change forms from one to another, such as potential to kinetic energy.
This document provides information about work, energy, and the different types of energy. It begins with definitions of work and discusses how work is calculated based on force and distance. It then defines different types of energy including kinetic energy, potential energy, heat energy, chemical energy, electromagnetic energy, and nuclear energy. Examples are provided to demonstrate how to calculate work, kinetic energy, and potential energy. The last sections discuss conservative and non-conservative forces and how the law of conservation of energy applies.
Presentation on Work and Energy, including different forms of energy, calculating kinetic and potential energy, applying the principle of conservation of mechanical energy, applying kinetic energy theorem, calculating power. All with figures and videos that illustrate the concept.
Work is done when a force causes an object to move in the direction of the force. Work is measured in joules, which is equal to applying a force of 1 newton over a distance of 1 meter. Power is the rate at which work is done and is measured in watts. The work-energy theorem states that work done on an object transforms into a change in the object's kinetic energy. Various types of energy, such as gravitational potential energy, kinetic energy, and heat can be transformed into one another but the total amount of energy remains constant due to the law of conservation of energy.
The document outlines key concepts related to work, energy, and power including defining these terms, calculating kinetic and potential energy using formulas, stating the principle of conservation of energy as it relates to the conversion of energy forms, applying these concepts to solve related problems, and calculating mechanical system efficiency. The goal is to understand these fundamental physics concepts and be able to measure, calculate and apply work, energy and power.
Power is defined in physics as the rate at which work is done or energy is transferred. The equation for power is power equals work done divided by time taken, with units of watts. Calculating power involves determining the work done by an object and dividing it by the time taken to perform that work. Examples are provided of calculating the power of a fork lift truck and a mouse running up a curtain.
Work, power and energy are quantitative properties related to the ability to do work or induce heat. Mechanical energy is the sum of potential and kinetic energy and exists in objects due to motion or position. Kinetic energy is the energy of motion and depends on an object's mass and speed, while potential energy is stored energy that depends on an object's height or the elastic forces acting on it. Mechanical energy is transformed between other forms but the total amount remains constant in a closed system without dissipative forces.
The presentation discusses the concepts of energy and work. Energy is defined as the ability to do work or produce force over a distance, and comes from Greek meaning "activity." Work requires both a force and displacement in the direction of the force and can be calculated as work = force x distance. Examples of different types of energy - chemical, electrical, nuclear, sound, and mechanical - are provided. The relationship between work and energy is also explained, where work transfers energy and energy is the ability to do work.
The document discusses various topics relating to air temperature, including:
1) How daily, monthly, and annual mean temperatures are calculated from temperature data readings.
2) The main controls that cause temperatures to vary, such as differential heating of land and water, ocean currents, altitude, geographic position, and cloud cover/albedo.
3) Additional factors like land/water differences, ocean currents, altitude, windward/leeward coasts, and the global distribution of temperatures.
4) Cycles of air temperatures including daily and annual variations.
5) Instruments used to measure temperature and their shelters.
6) Common temperature scales and their reference points.
7) Indices used to
This document provides an overview of circular motion and Newton's law of universal gravitation. It defines key concepts like centripetal acceleration, tangential speed, and centripetal force. Examples are provided to demonstrate how to calculate tangential speed from centripetal acceleration and radius. Newton's law of gravitation defines the gravitational force between objects in terms of their masses and the distance between their centers. Kepler's laws of planetary motion are introduced along with concepts like orbital periods and apparent weightlessness in orbiting spacecraft.
I do not have enough information to fully answer the questions. The passage provides the kinetic energy and heights of points A and B, but does not give the mass of the block, which is needed to calculate kinetic energy at B using the work-energy theorem. It also does not provide the distance or time of travel between B and C, which would be needed to calculate the work done by friction during the BC segment.
The document summarizes key concepts relating to work, power, efficiency, and energy flow. It defines work as the transfer of energy through motion requiring a force over a distance. Power is the rate at which work is done or energy is used. Efficiency refers to the ratio of useful energy output to the total energy input. Energy flow diagrams can be used to trace the storage, conversion, transmission and output of energy through a system, identifying losses at each step.
Work, Power & Energy for Class X CBSE and ICSEKeyurMaradiya
Work is defined as the product of the force applied and the displacement in the direction of the force. Work can be positive, negative, or zero depending on the angle between the force and displacement vectors. The SI unit of work is the joule.
Power is defined as the rate of doing work, or the amount of work done per unit time. The SI unit of power is the watt.
Energy is the ability to do work and exists in various forms including kinetic energy, potential energy, and mechanical energy. The law of conservation of energy states that the total energy in an isolated system remains constant. It can be transformed from one form to another but cannot be created or destroyed.
The document discusses the work-energy theorem and how it relates to changes in kinetic energy, potential energy, and thermal energy. It provides examples of calculating work done to change an object's speed and examples of calculating thermal energy generated from friction. The final section lists three example problems involving calculating initial or final velocities given information about work done and masses of objects.
- This chapter discusses work, energy, and power. It explains the relationships between these concepts and covers energy changes and mechanical efficiency.
- Students will learn to define and calculate work, energy, and power using formulas like kinetic energy (Ek = 1/2mv2), gravitational potential energy (Ep = mgh), and power (P = W/t). They will also learn about the conservation of energy and conversions between different energy forms.
- Examples are provided to demonstrate calculating speed, work, efficiency, and more by applying the relevant formulas to mechanical systems and problems.
A simple ppt yet interactive on the topic work power and energy. With smooth design and looks the ppt is very good for clearing the basics related to this topic, hope it will help you further.
Potential energy is energy stored in an object due to its position or state. There are different types of potential energy including gravitational potential energy, which is the energy an object gains when lifted against the force of gravity. Gravitational potential energy is calculated as the product of mass, acceleration due to gravity, and height. Kinetic energy is the energy of motion an object has due to its mass and velocity. As an object gains potential energy, it loses kinetic energy and vice versa.
1) Chapter 6 discusses work, energy, and power, defining kinetic energy as the energy of motion and potential energy as energy associated with positional forces.
2) The work-energy principle states that the net work done on an object equals its change in kinetic energy. For conservative forces only, the total mechanical energy is conserved.
3) Power is defined as the rate at which work is done or energy is transferred. Units of power include watts and horsepower.
1) In an elastic collision between two bodies in one dimension, both linear momentum and kinetic energy are conserved.
2) By applying the laws of conservation of momentum and kinetic energy, equations relating the velocities of the bodies before and after collision can be derived.
3) These equations allow calculating the unknown velocities if the masses of the bodies and their velocities before collision are known.
Explain work, energy and power. The Law of Conservation of Energy is utilized as well as conservative and non conservative systems.
**More good stuff available at:
www.wsautter.com
and
http://www.youtube.com/results?search_query=wnsautter&aq=f
Power Point Presentation ''Work Power Energy" Arun Murali
1) Work is done when a force causes an object to move through a distance. It is calculated as work = force x distance.
2) There are different types of energy including kinetic energy from motion, potential energy that is stored, and many others.
3) The law of conservation of energy states that the total energy in an isolated system remains constant, although it can change forms from one to another, such as potential to kinetic energy.
This document provides information about work, energy, and the different types of energy. It begins with definitions of work and discusses how work is calculated based on force and distance. It then defines different types of energy including kinetic energy, potential energy, heat energy, chemical energy, electromagnetic energy, and nuclear energy. Examples are provided to demonstrate how to calculate work, kinetic energy, and potential energy. The last sections discuss conservative and non-conservative forces and how the law of conservation of energy applies.
Presentation on Work and Energy, including different forms of energy, calculating kinetic and potential energy, applying the principle of conservation of mechanical energy, applying kinetic energy theorem, calculating power. All with figures and videos that illustrate the concept.
Work is done when a force causes an object to move in the direction of the force. Work is measured in joules, which is equal to applying a force of 1 newton over a distance of 1 meter. Power is the rate at which work is done and is measured in watts. The work-energy theorem states that work done on an object transforms into a change in the object's kinetic energy. Various types of energy, such as gravitational potential energy, kinetic energy, and heat can be transformed into one another but the total amount of energy remains constant due to the law of conservation of energy.
The document outlines key concepts related to work, energy, and power including defining these terms, calculating kinetic and potential energy using formulas, stating the principle of conservation of energy as it relates to the conversion of energy forms, applying these concepts to solve related problems, and calculating mechanical system efficiency. The goal is to understand these fundamental physics concepts and be able to measure, calculate and apply work, energy and power.
Power is defined in physics as the rate at which work is done or energy is transferred. The equation for power is power equals work done divided by time taken, with units of watts. Calculating power involves determining the work done by an object and dividing it by the time taken to perform that work. Examples are provided of calculating the power of a fork lift truck and a mouse running up a curtain.
Work, power and energy are quantitative properties related to the ability to do work or induce heat. Mechanical energy is the sum of potential and kinetic energy and exists in objects due to motion or position. Kinetic energy is the energy of motion and depends on an object's mass and speed, while potential energy is stored energy that depends on an object's height or the elastic forces acting on it. Mechanical energy is transformed between other forms but the total amount remains constant in a closed system without dissipative forces.
The presentation discusses the concepts of energy and work. Energy is defined as the ability to do work or produce force over a distance, and comes from Greek meaning "activity." Work requires both a force and displacement in the direction of the force and can be calculated as work = force x distance. Examples of different types of energy - chemical, electrical, nuclear, sound, and mechanical - are provided. The relationship between work and energy is also explained, where work transfers energy and energy is the ability to do work.
The document discusses various topics relating to air temperature, including:
1) How daily, monthly, and annual mean temperatures are calculated from temperature data readings.
2) The main controls that cause temperatures to vary, such as differential heating of land and water, ocean currents, altitude, geographic position, and cloud cover/albedo.
3) Additional factors like land/water differences, ocean currents, altitude, windward/leeward coasts, and the global distribution of temperatures.
4) Cycles of air temperatures including daily and annual variations.
5) Instruments used to measure temperature and their shelters.
6) Common temperature scales and their reference points.
7) Indices used to
This document provides an overview of circular motion and Newton's law of universal gravitation. It defines key concepts like centripetal acceleration, tangential speed, and centripetal force. Examples are provided to demonstrate how to calculate tangential speed from centripetal acceleration and radius. Newton's law of gravitation defines the gravitational force between objects in terms of their masses and the distance between their centers. Kepler's laws of planetary motion are introduced along with concepts like orbital periods and apparent weightlessness in orbiting spacecraft.
The document discusses forces and Newton's laws of motion. It begins by defining a force as a push or pull that can change an object's motion. Forces are measured in newtons and can be contact forces or field forces. Newton's first law states that objects in motion stay in motion and objects at rest stay at rest unless acted upon by a net force. Newton's second law relates force, mass, and acceleration. Newton's third law states that for every action there is an equal and opposite reaction. Friction and gravity are everyday forces that can affect motion.
The document discusses atmospheric stability and its relationship to moisture and weather. It defines stable, unstable, and conditionally unstable atmospheres based on environmental lapse rates. Stability impacts cloud formation and precipitation - unstable air leads to tall clouds and heavy rain while stable air suppresses vertical air movement and yields light precipitation. Daily changes in temperature and moisture content can increase or decrease atmospheric stability.
Here are the key points about electric fields based on the document:
- An electric field (E) represents the influence of an electric charge. It has magnitude and direction at each point in space.
- The direction of electric field lines indicates the direction of the electric force on a positive test charge placed at that point.
- The density of electric field lines indicates the strength of the electric field - more closely spaced lines means a stronger field.
- Electric field lines outside a conductor must be perpendicular to the conductor's surface because charges within a conductor redistribute such that the net electric field inside a conductor is always zero due to electrostatic equilibrium.
Household circuits are typically wired in parallel. This has several advantages:
- If one outlet or fixture fails, it does not disable the entire circuit. This is safer and more reliable than series wiring.
- The current drawn by each device is the same as the current supplied by the circuit. In parallel wiring, adding or removing a device does not change the current to the other devices on the circuit. In series, the current must pass through each device in order.
- Parallel wiring allows each outlet or fixture to receive the full voltage supplied by the circuit. In series wiring, the voltage would decrease across multiple components.
The main disadvantage of series wiring a household circuit would be that a failure of any one component would
The document discusses air pressure and winds, including how air pressure is measured, how it varies with altitude and due to other factors, the forces that affect wind including pressure gradients, Coriolis force and friction, different wind patterns at various altitudes and at the surface, how winds generate vertical air motion, and how wind is measured. It provides details on these topics over several sections and pages with diagrams.
The document discusses Earth's heat budget and the factors that influence it. It explains that Earth receives energy from the sun and loses energy through radiation and that these energy inputs and outputs must balance annually for Earth's overall heat budget. However, there are imbalances at different latitudes that drive winds and ocean currents to redistribute heat globally. Key concepts covered include the greenhouse effect, mechanisms of heat transfer like conduction and radiation, and how gases in the atmosphere impact heating.
Waves transport energy through a medium rather than matter. There are two main types of waves: transverse waves, where the medium moves perpendicular to the wave's direction of travel, and longitudinal waves, where the medium moves parallel to the direction of travel. Key wave parameters include amplitude, wavelength, frequency, period, and speed. The wavelength is the distance between two equivalent points on consecutive waves, frequency is the number of waves passing a point per second, and speed depends on the properties of the medium and can be calculated as speed equals wavelength times frequency.
The document discusses the structure and composition of Earth's atmosphere. It describes how the atmosphere is divided into vertical layers including the troposphere, stratosphere, mesosphere, and thermosphere. Temperature decreases with increasing altitude in the troposphere but increases with altitude in the stratosphere and above. The composition of the atmosphere also varies with altitude, transitioning from a homosphere below 80km to a heterosphere of separate gas shells above 80km.
Cloud formation occurs through adiabatic cooling or lifting of air parcels to their dew point temperature. Clouds are classified based on their height and form. High clouds like cirrus are made of ice crystals while low clouds like stratus are uniform layers near the surface. Fog forms through different cooling processes like radiation, advection, or evaporation. Precipitation forms through the Bergeron process using ice crystals or collision-coalescence of water droplets. Rain, snow, sleet, hail, and freezing rain are different types of precipitation. Weather modification techniques like cloud seeding are used to artificially influence precipitation and other weather phenomena.
The document describes the global circulation of the atmosphere and factors that influence winds and precipitation patterns worldwide. It discusses various scales of atmospheric motion from microscale to macroscale winds. Key factors like pressure zones, jet streams, ocean currents, monsoons, and phenomena like El Niño and La Niña are examined in relation to how they drive global wind and precipitation patterns.
This document discusses thunderstorms, tornadoes, and hurricanes. It describes the different types of thunderstorms like air-mass thunderstorms and severe thunderstorms including supercell thunderstorms. Tornado formation and occurrence are explained detailing how mesocyclones form and funnel clouds develop. Hurricanes are introduced covering their profile, formation from tropical disturbances, and decay when they move over land or cooler waters.
The document discusses air pressure and winds, including how air pressure is measured, how it varies with altitude and due to other factors, the forces that affect wind including pressure gradients, Coriolis force and friction, different wind patterns at various altitudes and near the surface, how winds generate vertical air motion, and how wind is measured. It provides details on these topics over several sections and pages with diagrams.
This document discusses the conservation of energy. It explains that energy cannot be created or destroyed, but rather is transferred from one form to another. Some key points made include:
- Energy exists in various forms including kinetic, potential, chemical, thermal, and mechanical.
- Mechanical energy is the sum of kinetic and potential energy in a system. It remains constant as energy transforms between these two forms, for example as an object gains kinetic energy while losing gravitational potential energy.
- The law of conservation of energy states that the total energy in an isolated system is constant. Energy transforms between forms through processes like friction, but the overall quantity remains the same.
The document summarizes Darwin's theory of evolution by natural selection. It describes Darwin's voyage on the HMS Beagle where he observed patterns of diversity among species in places like the Galapagos Islands. This led him to propose that life evolves over time through natural selection, where traits beneficial for survival are passed on while others die out. The document also outlines evidence that shaped Darwin's thinking, such as fossils, biogeography, and homologous and vestigial structures between organisms.
The AMAZING Success of Indian Immigrants in America!Richard Herman
This is the powerpoint presentation that I am delivering today, 9/13, as part of the Onam Ponnonam celebration hosted by the Kerala Association of Ohio.
The discussion focuses on the amazing contributions of immigrants to America, with a special emphasis on immigrants from India.
The data demonstrates that immigration is America's secret weapon in the hyper-competitive global economy, and that the long-standing immigration reform debate is improperly framed and ultimately undermines the nation's economic and national security.
Immigrants from all countries contribute mightily to the country's economic development, job creation and innovation.
Immigrants from India stand-out from the pack.
I was quoted in this recent article from International Business Times (referring to a quote in Forbes):
”It’s not a surprise that we’re seeing Indians rise in corporate ranks,” said Richard Herman, co-author of a book entitled "U.S., Immigrant Inc.," to Forbes. "Of all the immigrant groups coming in today, Indians are head-and-shoulders above others, and this is partly because of their English-language skills and also the advanced education that many of them are bringing to the U.S.”
http://www.ibtimes.com/rise-indian-americans-u-s-business-infographic-1560450
America needs to understand the job-creation benefits of welcoming immigrants, integrating the foreign-born, and passing comprehensive immigration reform.
Delay on this front is jeopardizing America's future.
This document provides a summary of key concepts from a physics textbook chapter on one-dimensional motion, including:
1. Displacement, velocity, and acceleration are defined and equations for calculating average velocity, displacement, and final velocity given initial velocity, acceleration, and time are presented.
2. Free fall under the influence of gravity is discussed and equations for calculating time and final velocity of falling objects are given.
3. Graphs of position, velocity, and acceleration over time are used to describe and analyze examples of one-dimensional motion including constant velocity, acceleration, deceleration, and free fall.
Powerpoint notes over Chapter 4 of National Geographic's World cultures test. Covers North America current events, including globalization and immigration issues.
This document summarizes key concepts about two-dimensional motion and vectors:
1) It introduces scalars, which have magnitude but no direction, and vectors, which have both magnitude and direction.
2) It describes methods for adding vectors graphically by drawing them as arrows and finding the resultant, or using trigonometry.
3) It explains projectile motion as objects moving under gravity with both horizontal and vertical components of motion that can be analyzed separately using kinematic equations.
Work is done when a force causes an object to be displaced. Work (W) is equal to force (F) multiplied by displacement (s). Work units are joules. Potential energy is stored energy due to an object's position or state. Kinetic energy is the energy of motion and depends on an object's mass and velocity. Power is the rate at which work is done or energy is converted and is measured in watts. Conservation of energy states that energy cannot be created or destroyed, only changed from one form to another.
The lecture covered potential energy and the conservation of energy. Key points included:
1) Work done by conservative forces like gravity is independent of path. Potential energy U can be defined as mgh for gravity and 1/2kx^2 for springs.
2) The work-energy theorem states the work done by non-conservative forces equals the change in kinetic and potential energy.
3) For problems involving gravity, conservation of energy can be used to calculate changes in speed and height by setting the initial gravitational potential energy equal to the final kinetic and potential energies.
The lecture covered potential energy and the conservation of energy. Key concepts included:
1) Work done by conservative forces like gravity is independent of path. Potential energy U can be defined as mgh for gravity and 1/2kx^2 for springs.
2) The work-energy theorem states the work done by non-conservative forces equals the change in kinetic energy plus potential energy.
3) Problems can be solved using the conservation of energy principle that the total energy at the start equals the total energy at the end.
This document provides an overview of key concepts related to work, energy, and power including:
- The definitions and relationships between work, kinetic energy, gravitational potential energy, and elastic potential energy.
- Conservative and non-conservative forces.
- How to calculate work done by non-conservative forces.
- The work-energy theorem and the law of conservation of energy.
- The definition of power as the rate of doing work.
The document discusses various physics concepts related to work, energy and power including:
- The definition of work in physics and the formula to calculate work.
- Kinetic energy and its formula. Kinetic energy depends on an object's mass and velocity.
- Gravitational potential energy and its formula. Gravitational potential energy depends on an object's mass, height above ground, and gravitational acceleration.
- The principles of conservation and conversion of energy. Energy cannot be created or destroyed, it can only change form.
1) Work is done when a force causes an object to move in the direction of the force. Different types of energy include kinetic, potential, chemical and thermal.
2) The principle of conservation of energy states that energy cannot be created or destroyed, only converted from one form to another.
3) Kinetic energy is defined as E_k=1/2mv^2 and gravitational potential energy as E_p=mgh. These relationships can be used to solve problems involving work, energy and power.
This document covers concepts related to work, energy, and power. It begins by defining work as the mechanical transfer of energy due to external forces, and is equal to the product of the force and the displacement in the direction of the force. Various examples are provided to illustrate situations where work is and isn't being done. The relationship between work and energy transfer is explained. Kinetic and potential energy are introduced, and analogies are provided. Methods for calculating work, energy, and power are demonstrated through examples.
This document discusses work, energy, and power in physics. It defines work as the scalar product of force and displacement along the direction of force. Work is a transfer of energy and can be positive, negative, or zero. The work-energy theorem states that work done on an object changes its kinetic energy. Potential energy includes gravitational potential energy, which depends on an object's height above ground. Elastic potential energy is stored in compressed or stretched springs. Energy is always conserved and can change forms between kinetic and potential. Power is the rate at which work is done or energy is transferred.
The document discusses key physics concepts related to motion, forces, energy, and electricity. It defines terms like speed, velocity, acceleration, force, work, power, kinetic energy, potential energy, current, voltage, and resistance. Formulas are provided for calculating these values along with example problems and explanations of physics principles.
This document discusses concepts related to work, energy, and power. It defines work as the scalar dot product between force and displacement, and explains that work done on an object results in a change in its kinetic energy. It also discusses different types of energy including kinetic energy, potential energy, elastic potential energy, and the law of conservation of energy. Hooke's law relating the force of an extended or compressed spring to its displacement is also covered. Examples are provided to demonstrate applying concepts like the work-energy theorem to calculate changes in speed and energy.
Okay, let me break this down step-by-step:
* Spring constant (k) = 280 N/m
* Mass (m) = 0.0025 kg
* Deflection (x) = 0.03 m
* EPE = 0.5kx2 = 0.5 * 280 N/m * (0.03 m)2 = 0.81 J
* EPE converts to KE on release: KE = 0.81 J = 0.5mv2
* Solve for v: v = √(2 * 0.81 J / 0.0025 kg) = 4 m/s
* Use v to find maximum height using: h = v2/2g = (
Okay, let me break this down step-by-step:
* Spring constant (k) = 280 N/m
* Mass (m) = 0.0025 kg
* Deflection (x) = 0.03 m
* EPE = 0.5kx2 = 0.5 * 280 N/m * (0.03 m)2 = 0.81 J
* EPE converts to KE on release: KE = 0.81 J = 0.5mv2
* Solve for v: v = √(2 * 0.81 J / 0.0025 kg) = 4 m/s
* Use v to find maximum height using: h = v2/2g = (
Unit 4 discusses work, energy, and power. It explains that energy cannot be created or destroyed, only changed from one form to another. The main forms of energy discussed are mechanical, chemical, electromagnetic, nuclear, heat, and sound. Work is defined as the product of the force component along the direction of displacement and the magnitude of displacement. Kinetic energy is related to an object's motion. The work-kinetic energy theorem states that the net work done on an object equals its change in kinetic energy. Potential energy is based on an object's position. Conservation of energy principles apply when analyzing problems involving work, kinetic energy, and potential energy. Nonconservative forces like friction violate conservation of energy since they convert mechanical energy
The document provides notes from a physics class that covered topics including friction, conservation of energy, and kinetic and potential energy. Students calculated coefficients of friction, solved problems involving sliding friction, and performed an experiment launching pennies into the air using a ruler. The class discussed forms of energy, energy transformations, and formulas for gravitational potential energy, kinetic energy, and elastic potential energy. Sample problems were worked through applying these concepts and units.
1. The document discusses different topics related to work, energy and power including dot product, definitions of work and energy, forms of energy, kinetic energy, work-energy theorem, and potential energy.
2. Key concepts covered are the mathematical definitions of work as the product of force and displacement, and of kinetic energy as one-half mass times velocity squared.
3. The work-energy theorem states that the work done on an object equals its change in kinetic energy, or the work equals the final kinetic energy minus the initial kinetic energy.
The document discusses work, energy, and the work-energy principle as an alternative way to analyze motion compared to using forces and Newton's laws. It defines key terms like work, kinetic energy, and systems. The work-energy principle states that the net work done on an object equals its change in kinetic energy (Wnet = ΔKE). This allows reexpressing Newton's second law in terms of energy rather than forces. Examples show how to calculate work, kinetic energy, and use the work-energy principle to solve motion problems.
1. The document discusses scalar products (dot products) of vectors, work, power, and kinetic energy. It provides examples of calculating scalar products, work done by forces, and kinetic energy.
2. Key points made include that scalar product is also called dot product, work is force times distance, the unit of work and energy is the Joule, and kinetic energy is one-half mass times velocity squared.
3. Practice problems are provided to calculate scalar products, work, power, and kinetic energy given different vectors and scenarios.
Work, energy, and power are explained in the document. There are many types of energy expressed in joules. Work is the scalar dot product of force and displacement and is a measure of energy. The work-energy theorem states that work done on an object results in a change in its kinetic energy. Power is the rate at which work is done or energy is transferred over time and is measured in watts.
The spring constant is found by k=F/x, which gives k=64,000 N/m. The work done on the spring is found using W=1/2kx^2, which is 3,200 J. The force to stretch it 1.90 m is kx or 121,600 N. The power used is the work done divided by time, which is 1,600 W.
This document provides a summary of key concepts relating to work, energy, and power. It defines work as the scalar dot product between force and displacement. Kinetic energy is defined using Newton's second law and work-energy theorem states that the net work done on an object equals its change in kinetic energy. Potential energy is defined as being stored when an object is lifted against gravity. The law of conservation of energy is described as energy cannot be created or destroyed, only transformed between potential and kinetic forms. Power is defined as the rate at which energy is used or stored.
This document provides an overview of two-dimensional motion and vectors. It introduces scalars and vectors, and discusses how to add vectors graphically or using trigonometric functions. Projectile motion is also summarized, noting that the vertical and horizontal components of a projectile's motion are independent, and can be analyzed separately using kinematic equations. Examples are provided for adding vectors, resolving vectors into components, and solving projectile motion problems.
f = nv/2L
So the frequency depends on:
- n, the harmonic number
- v, the wave speed
- L, the string length
You could change the pitch by:
- Changing the tension on the string (affects v)
- Trimming the string length L
- Playing a harmonic (higher n)
So different instruments with the same note have the same frequency but different timbres due to differences in their resonating structures exciting different harmonics.
The two waves would pass through each other and continue traveling in their original directions. At the point where they meet, both waves would be visible as their displacements add together through superposition. If a crest met a trough, they would undergo destructive interference and cancel each other out at the point where they meet.
The document provides information about electrical energy, potential difference, capacitance, current, resistance, and power. It defines key concepts such as volts, capacitance, resistance, Ohm's Law, electric current, direct current, alternating current, and electric power. It also includes examples of calculating charge, energy, current, resistance, and power using given values and equations.
This document provides an overview of momentum and collisions from a physics textbook. It discusses key topics like:
1) Momentum is proportional to mass and velocity, and momentum is conserved during collisions.
2) Impulse equals change in momentum, and greater changes in momentum require more force or time. Features like airbags and crumple zones in cars are designed to reduce force during collisions by increasing time over which force is applied.
3) Collisions can be perfectly elastic, perfectly inelastic, or inelastic. In perfectly inelastic collisions, objects stick together after collision and momentum is analyzed for the combined final mass.
The document summarizes key concepts about circular motion, Newton's law of universal gravitation, motion in space, and weightlessness. It discusses centripetal acceleration and force, Kepler's laws of planetary motion, and how apparent weightlessness occurs in falling elevators and orbiting spacecraft due to inertia rather than a lack of gravitational force. Examples and equations are provided to calculate values like tangential speed, centripetal force, gravitational force, and planetary orbital properties.
This document discusses two-dimensional motion and vectors. It defines scalars and vectors, and explains how to add vectors graphically and using trigonometric functions. Projectile motion is described as having independent vertical and horizontal components due to gravity. Examples show how to use trigonometric functions to find the magnitude and direction of resulting vectors, resolve vectors into horizontal and vertical components, and solve projectile motion problems by treating vertical and horizontal motions separately.
1. Motion can be described as a change in an object's position over time. Examples include a train moving along tracks or an object falling due to gravity.
2. Displacement describes the direction and size of an object's movement from its starting point. It is a vector quantity while distance traveled is a scalar.
3. Velocity is displacement divided by time and describes both speed and direction of motion. Acceleration is the rate of change of velocity with respect to time. During free fall, acceleration due to gravity is constant.
The document discusses motion in one dimension, including displacement, velocity, acceleration, and free fall. It defines key terms like displacement as a change in position, average velocity as displacement over time, and acceleration. Examples show how to calculate displacement, velocity, and acceleration using equations. Free fall acceleration is constant at about 10 m/s^2 downward. Graphs of position, velocity, and acceleration over time are used to represent motion.
This document summarizes key concepts about populations including:
1) Three important characteristics of populations are geographic distribution, density, and growth rate. Population density refers to the number of individuals per unit area.
2) Population growth is determined by births, deaths, and migration in and out of an area. It can be positive or negative.
3) Exponential growth occurs when a population reproduces at a constant rate, initially slowly and then more rapidly. Logistic growth follows an S-curve as the population levels off due to limits on resources.
4) Limits to population growth include limiting factors like competition, predation, disease, and climate/human impacts. Density dependent factors depend on population size
The document introduces the animal kingdom by defining animals as heterotrophic, multicellular eukaryotes that are either invertebrates without backbones or vertebrates with backbones. It describes the basic functions of feeding, respiration, circulation, excretion, response, movement, and reproduction. Key trends in animal evolution are also summarized, including cell specialization, bilateral body symmetry, cephalization, and the formation of internal body cavities.
The document discusses different levels of ecological organization from species to biosphere. It describes producers, consumers, trophic levels, food chains and food webs. Energy and matter cycle through ecosystems. The water, carbon, nitrogen and phosphorus cycles are important biogeochemical cycles that move elements through living and nonliving parts of the biosphere.
UiPath Test Automation using UiPath Test Suite series, part 6DianaGray10
Welcome to UiPath Test Automation using UiPath Test Suite series part 6. In this session, we will cover Test Automation with generative AI and Open AI.
UiPath Test Automation with generative AI and Open AI webinar offers an in-depth exploration of leveraging cutting-edge technologies for test automation within the UiPath platform. Attendees will delve into the integration of generative AI, a test automation solution, with Open AI advanced natural language processing capabilities.
Throughout the session, participants will discover how this synergy empowers testers to automate repetitive tasks, enhance testing accuracy, and expedite the software testing life cycle. Topics covered include the seamless integration process, practical use cases, and the benefits of harnessing AI-driven automation for UiPath testing initiatives. By attending this webinar, testers, and automation professionals can gain valuable insights into harnessing the power of AI to optimize their test automation workflows within the UiPath ecosystem, ultimately driving efficiency and quality in software development processes.
What will you get from this session?
1. Insights into integrating generative AI.
2. Understanding how this integration enhances test automation within the UiPath platform
3. Practical demonstrations
4. Exploration of real-world use cases illustrating the benefits of AI-driven test automation for UiPath
Topics covered:
What is generative AI
Test Automation with generative AI and Open AI.
UiPath integration with generative AI
Speaker:
Deepak Rai, Automation Practice Lead, Boundaryless Group and UiPath MVP
In the rapidly evolving landscape of technologies, XML continues to play a vital role in structuring, storing, and transporting data across diverse systems. The recent advancements in artificial intelligence (AI) present new methodologies for enhancing XML development workflows, introducing efficiency, automation, and intelligent capabilities. This presentation will outline the scope and perspective of utilizing AI in XML development. The potential benefits and the possible pitfalls will be highlighted, providing a balanced view of the subject.
We will explore the capabilities of AI in understanding XML markup languages and autonomously creating structured XML content. Additionally, we will examine the capacity of AI to enrich plain text with appropriate XML markup. Practical examples and methodological guidelines will be provided to elucidate how AI can be effectively prompted to interpret and generate accurate XML markup.
Further emphasis will be placed on the role of AI in developing XSLT, or schemas such as XSD and Schematron. We will address the techniques and strategies adopted to create prompts for generating code, explaining code, or refactoring the code, and the results achieved.
The discussion will extend to how AI can be used to transform XML content. In particular, the focus will be on the use of AI XPath extension functions in XSLT, Schematron, Schematron Quick Fixes, or for XML content refactoring.
The presentation aims to deliver a comprehensive overview of AI usage in XML development, providing attendees with the necessary knowledge to make informed decisions. Whether you’re at the early stages of adopting AI or considering integrating it in advanced XML development, this presentation will cover all levels of expertise.
By highlighting the potential advantages and challenges of integrating AI with XML development tools and languages, the presentation seeks to inspire thoughtful conversation around the future of XML development. We’ll not only delve into the technical aspects of AI-powered XML development but also discuss practical implications and possible future directions.
Programming Foundation Models with DSPy - Meetup SlidesZilliz
Prompting language models is hard, while programming language models is easy. In this talk, I will discuss the state-of-the-art framework DSPy for programming foundation models with its powerful optimizers and runtime constraint system.
Your One-Stop Shop for Python Success: Top 10 US Python Development Providersakankshawande
Simplify your search for a reliable Python development partner! This list presents the top 10 trusted US providers offering comprehensive Python development services, ensuring your project's success from conception to completion.
Best 20 SEO Techniques To Improve Website Visibility In SERPPixlogix Infotech
Boost your website's visibility with proven SEO techniques! Our latest blog dives into essential strategies to enhance your online presence, increase traffic, and rank higher on search engines. From keyword optimization to quality content creation, learn how to make your site stand out in the crowded digital landscape. Discover actionable tips and expert insights to elevate your SEO game.
Climate Impact of Software Testing at Nordic Testing DaysKari Kakkonen
My slides at Nordic Testing Days 6.6.2024
Climate impact / sustainability of software testing discussed on the talk. ICT and testing must carry their part of global responsibility to help with the climat warming. We can minimize the carbon footprint but we can also have a carbon handprint, a positive impact on the climate. Quality characteristics can be added with sustainability, and then measured continuously. Test environments can be used less, and in smaller scale and on demand. Test techniques can be used in optimizing or minimizing number of tests. Test automation can be used to speed up testing.
Cosa hanno in comune un mattoncino Lego e la backdoor XZ?Speck&Tech
ABSTRACT: A prima vista, un mattoncino Lego e la backdoor XZ potrebbero avere in comune il fatto di essere entrambi blocchi di costruzione, o dipendenze di progetti creativi e software. La realtà è che un mattoncino Lego e il caso della backdoor XZ hanno molto di più di tutto ciò in comune.
Partecipate alla presentazione per immergervi in una storia di interoperabilità, standard e formati aperti, per poi discutere del ruolo importante che i contributori hanno in una comunità open source sostenibile.
BIO: Sostenitrice del software libero e dei formati standard e aperti. È stata un membro attivo dei progetti Fedora e openSUSE e ha co-fondato l'Associazione LibreItalia dove è stata coinvolta in diversi eventi, migrazioni e formazione relativi a LibreOffice. In precedenza ha lavorato a migrazioni e corsi di formazione su LibreOffice per diverse amministrazioni pubbliche e privati. Da gennaio 2020 lavora in SUSE come Software Release Engineer per Uyuni e SUSE Manager e quando non segue la sua passione per i computer e per Geeko coltiva la sua curiosità per l'astronomia (da cui deriva il suo nickname deneb_alpha).
CAKE: Sharing Slices of Confidential Data on BlockchainClaudio Di Ciccio
Presented at the CAiSE 2024 Forum, Intelligent Information Systems, June 6th, Limassol, Cyprus.
Synopsis: Cooperative information systems typically involve various entities in a collaborative process within a distributed environment. Blockchain technology offers a mechanism for automating such processes, even when only partial trust exists among participants. The data stored on the blockchain is replicated across all nodes in the network, ensuring accessibility to all participants. While this aspect facilitates traceability, integrity, and persistence, it poses challenges for adopting public blockchains in enterprise settings due to confidentiality issues. In this paper, we present a software tool named Control Access via Key Encryption (CAKE), designed to ensure data confidentiality in scenarios involving public blockchains. After outlining its core components and functionalities, we showcase the application of CAKE in the context of a real-world cyber-security project within the logistics domain.
Paper: https://doi.org/10.1007/978-3-031-61000-4_16
HCL Notes and Domino License Cost Reduction in the World of DLAUpanagenda
Webinar Recording: https://www.panagenda.com/webinars/hcl-notes-and-domino-license-cost-reduction-in-the-world-of-dlau/
The introduction of DLAU and the CCB & CCX licensing model caused quite a stir in the HCL community. As a Notes and Domino customer, you may have faced challenges with unexpected user counts and license costs. You probably have questions on how this new licensing approach works and how to benefit from it. Most importantly, you likely have budget constraints and want to save money where possible. Don’t worry, we can help with all of this!
We’ll show you how to fix common misconfigurations that cause higher-than-expected user counts, and how to identify accounts which you can deactivate to save money. There are also frequent patterns that can cause unnecessary cost, like using a person document instead of a mail-in for shared mailboxes. We’ll provide examples and solutions for those as well. And naturally we’ll explain the new licensing model.
Join HCL Ambassador Marc Thomas in this webinar with a special guest appearance from Franz Walder. It will give you the tools and know-how to stay on top of what is going on with Domino licensing. You will be able lower your cost through an optimized configuration and keep it low going forward.
These topics will be covered
- Reducing license cost by finding and fixing misconfigurations and superfluous accounts
- How do CCB and CCX licenses really work?
- Understanding the DLAU tool and how to best utilize it
- Tips for common problem areas, like team mailboxes, functional/test users, etc
- Practical examples and best practices to implement right away
Let's Integrate MuleSoft RPA, COMPOSER, APM with AWS IDP along with Slackshyamraj55
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We’ll kick things off by showcasing the most commonly used event-based triggers, introducing you to various automation workflows like manual triggers, schedules, directory watchers, and more. Plus, see how these elements play out in real scenarios.
Whether you’re tweaking your current setup or building from the ground up, this session will arm you with the tools and insights needed to transform your FME usage into a powerhouse of productivity. Join us to discover effective strategies that simplify complex processes, enhancing your productivity and transforming your data management practices with FME. Let’s turn complexity into clarity and make your workspaces work wonders!
AI 101: An Introduction to the Basics and Impact of Artificial IntelligenceIndexBug
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Mike Del Balso, CEO & Co-Founder at Tecton, presents "Full RAG," a novel approach to AI recommendation systems, aiming to push beyond the limitations of traditional models through a deep integration of contextual insights and real-time data, leveraging the Retrieval-Augmented Generation architecture. This talk will outline Full RAG's potential to significantly enhance personalization, address engineering challenges such as data management and model training, and introduce data enrichment with reranking as a key solution. Attendees will gain crucial insights into the importance of hyperpersonalization in AI, the capabilities of Full RAG for advanced personalization, and strategies for managing complex data integrations for deploying cutting-edge AI solutions.
Have you ever been confused by the myriad of choices offered by AWS for hosting a website or an API?
Lambda, Elastic Beanstalk, Lightsail, Amplify, S3 (and more!) can each host websites + APIs. But which one should we choose?
Which one is cheapest? Which one is fastest? Which one will scale to meet our needs?
Join me in this session as we dive into each AWS hosting service to determine which one is best for your scenario and explain why!
3. +
What do you think?
List five examples of things you have done in the
last year that you would consider work.
Based on these examples, how do you define
work?
4. +
Work
Inphysics, work is the magnitude of the force (F)
times the magnitude of the displacement (d) in
the same direction as the force.
W = Fd
What are the SI units for work?
Force units (N) distance units (m)
N•m are also called joules (J).
How much work is 1 joule?
Liftan apple weighing about 1 N from the floor to
the desk, a distance of about 1 m.
5. +
Work
Pushing this car is work because F and d are in
the same direction.
Why aren’t the following tasks considered
work?
A student holds a heavy chair at arm’s length for
several minutes.
A student carries a bucket of water along
a horizontal path while walking at a
constant velocity.
6. +
Work
At an angle you can use the below equation
to calculate the work being done
Ifthe angle is 90°, what is the component of F in
the direction of d?
Fcos 90° = 0
Ifthe angle is 0°, what is the component of F in
the direction of d?
Fcos 0° = F
7. +
Example
How much work is being done on a
vacuum cleaner pulled 3.0 m by a force of
50.0 N at an angle of 30° above the
horizontal?
Given:
F= 50.0N d= 3.0 m θ=30°
9. +
Classroom Practice Problem
A 20.0kg suitcase is raised 3.0 m above a
platform. How much work is done on the
suitcase?
Answer: 5.9 x 102 J or 590 J
10. +
Work is a Scalar
Work can be
positive or
negative but does
not have a
direction.
11. +
Sign of Work is Important
Work is positive
Force is in the same direction as the displacement
Work is negative
Forceis in a different direction as the
displacement
Sign of the net work lets you know if the object
is speeding up or down
+ for speeding up and work is being on object
- for slowing down and work is done by object
13. +
What do you think?
You have no doubt heard the term kinetic energy.
What is it?
What factors affect the kinetic energy of an object
and in what way?
Youhave no doubt heard the term potential
energy.
What is it?
What factors affect the potential energy of an object
and in what way?
14. +
Kinetic Energy
Energy associated with an object in
motion Wnet = Fd = mad
Since v2f = v2i + 2ad
v2
f vi2
2 2 Wnet m( )
Then v f v
i 2
ad
2
Finally 1 2 1 2
Wnet mv f mvi
2 2
15. +
Kinetic Energy
Kinetic energy depends on speed and
mass
The net work done on a body equals its
change in kinetic energy
SI units for KE
kg•m2/s2 or N•m or Joule (J)
16. +
Example
A 7.0 Kg bowling ball moves at 3.0 m/s. How
fast must a 2.45g ping pong ball move in order
to have the same kinetic energy as the bowling
ball? Is the speed reasonable for the ping
pong ball?
Given:
Bowling ball: m= 7.0 kg v= 3.0m/s
Ping pong: m= 2.45 g (this= 0.00245kg) v=??
17. +
Example
2KE
KE= ½ mv2 v
m
KE= ½ (7)(32)
2(31.5)
KE= 31.5 J v
0.00245
Rearrange Equation v = 160.36 m/s
to get v by itself
18. +
Classroom Practice Problems
A 6.00
kg cat runs after a mouse at 10.0
m/s. What is the cat’s kinetic energy?
Answer: 3.00 x 102 J or 300 J
Suppose the above cat accelerated to a
speed of 12.0 m/s while chasing the
mouse. How much work was done on the
cat to produce this change in speed?
Answer: 1.32 x 102 J or 132 J
19. +
Work and Kinetic Energy
KEis the work an object can do if the speed
changes.
Wnet is positive if the speed increases.
You must include all the forces that do work
on the object in calculating the net work done
20. +
Potential Energy
Energyassociated with an object’s potential
to move due to an interaction with its
environment; basically its stored energy
A book held above the desk
An arrow ready to be released from the bow
Some types of PE are listed below.
Gravitational
Elastic
Electromagnetic
21. +
Gravitational Potential Energy
Energy associated with an object due to the
object’s position relative to a gravitational
source
SI unit is still a Joule
Theheight (h) depends on the “zero level”
chosen where PEg= 0.
22. +
Elastic Potential Energy
Theenergy available for use in deformed elastic
objects
Rubber bands, springs in trampolines, pole-vault poles,
muscles
For springs, the distance compressed or stretched =
x
23. +
Elastic Potential Energy
The spring constant (k) depends on the
stiffness of the spring.
Stiffer
springs have higher k values.
Measured in N/m
Force in newtons needed to stretch a spring 1.0
meters
24. +
Example
A 70.0kg stuntman is attached to a bungee
cord with an unstretched length of 15m. He
jumps off a bridge from a height of 50m.
When he finally stops the cord has a
stretched length of 44m. Assuming the spring
constant is 71.8 N/m, what is the total PE
relative to the water when the man stops
falling?
26. +
Example
PEg= mgh PEelastic = ½ k x2
PEg= (70)(10)(6) PEelastic= ½ (71.8)(292)
PEg= 4200 J PEelastic= 30191.9J
PEtotal= PEg + PEelastic
PEtotal= 4200 + 30191.9
PEtotal= 34391.9J
27. +
Classroom Practice Problems
When a 2.00 kg mass is attached to a
vertical spring, the spring is stretched 10.0
cm such that the mass is 50.0 cm above the
table.
What is the gravitational potential energy
associated with the mass relative to the table?
Answer: 9.81 J
What is the spring’s elastic potential energy if
the spring constant is 400.0 N/m?
Answer: 2.00 J
29. +
What do you think?
Imagine two students standing side by side at the
top of a water slide. One steps off of the platform,
falling directly into the water below. The other
student goes down the slide. Assuming the slide
is frictionless, which student strikes the water
with a greater speed?
Explain your reasoning.
Would your answer change if the slide were not
frictionless? If so, how?
30. +
What do you think?
What is meant when scientists say a quantity
is conserved?
Describe
examples of quantities that are
conserved.
Are they always conserved? If not, why?
31. +
Mechanical Energy (ME)
ME = KE + PEg + PEelastic
Doesnot include the many other types of
energy, such as thermal energy, chemical
potential energy, and others
ME is not a new form of energy.
Just a combination of KE and PE
32. +
Conservation of Mechanical Energy
The sum of KE and PE remains constant.
One type of energy changes into another
type.
For the falling book, the PE of the book changed
into KE as it fell.
As a ball rolls up a hill, KE is changed into PE.
33. +
Example
Starting from rest, a child zooms down a
frictionless slide from an initial height of
3.0m. What is her speed at the bottom of
the slide? Her mass is 25kg.
Given:
vi= 0m/s hi= 3m m=25kg
vf= ?? hf=0m
34. +
Example
*Choose your equations
PE= mgh KE= ½ mv2
PEf= (25)(10)(0) KEf= ½ (25)v2
PEf= 0J KEf= ??
PEi= (25)(10)(3) KEi= ½ (25)(02)
PEi= 750J KEi= 0J
35. +
Example
*Put together
PEi+ KEi= PEf+ KEf
750 + 0 = 0 + ½ (25)vf2
750= 12.5 vf2
vf2 = √60
vf= 7.75m/s
36. +
Classroom Practice Problems
Suppose a 1.00 kg book is dropped from a height
of 2.00 m. Assume no air resistance.
Calculate the PE and the KE at the instant the book
is released.
Answer: PE = 19.6 J, KE = 0 J
Calculate the KE and PE when the book has fallen
1.0 m. (Hint: you will need an equation from Chapter
2.)
Answer: PE = 9.81 J, KE = 9.81 J
Calculate the PE and the KE just as the book
reaches the floor.
Answer: PE = 0 J, KE = 19.6 J
37. +
Table of Values for the Falling Book
h (m) PE(J) KE(J) ME(J)
0 19.6 0 19.6
0.5 14.7 4.9 19.6
1.0 9.8 9.8 19.6
1.5 4.9 14.7 19.6
2.0 0 19.6 19.6
38. +
Conservation of Energy
Acceleration does not have to be constant.
ME is not conserved if friction is present.
If friction is negligible, conservation of ME is reasonably
accurate.
A pendulum as it swings back and forth a few times
Consider a child going down a slide with friction.
What happens to the ME as he slides down?
Answer: It is not conserved but, instead, becomes less
and less.
The “lost” energy? is converted into nonmechanical
energy (thermal energy).
39. +
Classroom Practice Problems
A small 10.0 g ball is held to a slingshot that
is stretched 6.0 cm. The spring constant is
2.0 102 N/m.
What is the elastic potential energy of the
slingshot before release?
What is the kinetic energy of the ball right after
the slingshot is released?
What is the ball’s speed at the instant it leaves
the slingshot?
How high does the ball rise if it is shot directly
upward?
40. +
Now what do you think?
Imagine two students standing side by side at the
top of a water slide. One steps off of the platform,
falling directly into the water below. The other
student goes down the slide. Assuming the slide
is frictionless, which student strikes the water
with a greater speed?
Explain your reasoning.
Would your answer change if the slide were not
frictionless? If so, how?
41. +
Now what do you think?
What is meant when scientists say a quantity
is “conserved”?
Describe
examples of quantities that are
conserved.
Are they always conserved? If not, why?
43. +
What do you think?
Twocars are identical with one exception.
One of the cars has a more powerful engine.
How does having more power make the car
behave differently?
What does power mean?
What units are used to measure power?
44. +
Power
Therate at which work is done or
energy is transferred
Energy used or work done per second
If we substitute W for Fd then Fd
P
t
45. +
Power
SI units for power are J/s.
Calledwatts (W)
Equivalent to kg•m2/s3
Horsepower (hp) is a unit used in the
Avoirdupois system.
1.00 hp = 746 W
46. +
Watts
These bulbs all consume
different amounts of power.
A 100watt bulb consumes
100 joules of energy every
second.
47. +
Example
A 193kg curtain need to be raised 7.5m, at a
constant speed, in as close to 5 sec as
possible. Unsure which motor would be the
best 3 motors were bought. Power ratings are
1.0kW, 3.5kW, and 5.5kW. Which motor is
best for the job?
Given:
m= 193kg d= 7.5m t= 5 sec P=??
48. +
Example
W Fd mgd
P
t t t
(193)(10)(7.5)
P
5
P=2895 W or 2.895kW
So
the best motor would be the 3.5kW
motor
49. +
Classroom Practice Problems
Two horses pull a cart. Each exerts a
force of 250.0 N at a speed of 2.0 m/s for
10.0 min.
Calculate the power delivered by the
horses.
How much work is done by the two horses?
Answers: 1.0 x 103 W and 6.0 x 105 J
50. +
Now what do you think?
Twocars are identical with one exception.
One of the cars has a more powerful engine.
How does having more power make the car
behave differently?
What does power mean?
What units are used to measure power?