This document discusses concepts related to forces and motion, including Newton's laws of motion. It defines key terms like force, mass, weight, friction. Examples are provided to demonstrate calculating unknown values like acceleration, force, coefficient of friction using the equations of motion. Diagrams and step-by-step working are included to illustrate problem solving. Concepts covered include calculating net force, resolving forces into components, and determining static and kinetic friction forces.
This document discusses concepts related to rotational kinematics and dynamics including:
1. Rotational kinematics equations relating angular displacement (θ), angular velocity (ω), angular acceleration (α), and time (t).
2. Rotational dynamics equations relating torque (τ), moment of inertia (I), angular acceleration (α), and angular velocity (ω).
3. Examples calculating values like angular velocity, angular acceleration, linear velocity, torque, power, work, and kinetic energy for rotating objects using the rotational kinematics and dynamics equations.
This document discusses concepts in mechanics including:
1. Conditions for static equilibrium, including that the net force and net torque must equal zero.
2. Analysis of forces in different mechanical systems using free body diagrams and applying Newton's laws and principles of torque.
3. Problem solving techniques for calculating unknown forces, torques or accelerations given force diagrams and relevant equations of motion.
1. SchoolDD.com provides information about heat transfer and calorimetry. It explains key concepts like specific heat capacity, latent heat of fusion and vaporization, and uses equations like Q=mcΔT.
2. Examples are given to calculate the heat transfer involved in changing temperatures of substances. Specific heat values are provided for various materials at different phases.
3. Phase changes from solid to liquid to gas are explained, along with the concept of latent heat absorbed or released without changing temperature during these phase transitions.
This document discusses fluid dynamics and pressure. It defines density, pressure, and hydrostatic pressure. It provides examples of calculating hydrostatic pressure at different depths in fluids of varying densities. Formulas are given for calculating force, pressure, volume, and flow rate. Examples are worked through applying these formulas and concepts to problems involving submerged surfaces, fluids with different densities, and flow through pipes.
This document discusses electric current and concepts related to electricity. It contains the following key points:
1. Electric current is the flow of electric charge in a conductor. The direction of the flow is from higher electric potential to lower electric potential.
2. The factors that affect the magnitude of electric current include the amount of charge passing through a point in the conductor per unit time, and the resistance of the conductor.
3. Kirchhoff's laws relate the current and potential difference in different parts of an electric circuit.
Capítulo 07 falha por fadiga resultante de carregamento variávelJhayson Carvalho
The document provides calculations and solutions to example problems related to fatigue design and analysis. It includes determining endurance limits, fatigue stress concentrations, Goodman diagrams, and calculating fatigue life. Key equations from chapters 3, 7, 8, and the appendix are applied to examples involving shafts, beams, and other mechanical components made from various steel alloys. Material properties, load conditions, and geometric factors are considered to iteratively size components and check designs for sufficient fatigue life.
This document provides calculations and design considerations for sizing a flat belt drive system. It begins by giving parameters for the system including angular velocity ratio, nominal horsepower, pulley center distance, stiffness, and material properties. Initial calculations are shown to check for developed friction. The document then considers doubling the system size as a design task and provides the scaled calculations. It next shows a sample design process for selecting a belt width to meet the specified horsepower requirements. Finally, it solves for several values related to the maximum torque and slip conditions for the belt drive.
This document provides equations and calculations for determining the mean cycles to failure (x-bar) and standard deviation of cycles to failure (s_x) for a sample of fatigue test data. The sample data consists of the number of cycles to failure (x) and applied force (f) for 10 tests. The mean x-bar is calculated as the sum of the product of f and x divided by the sum of f, which equals 122.9 kcycles. The standard deviation s_x is calculated using the variance formula, which equals 30.3 kcycles.
This document discusses concepts related to rotational kinematics and dynamics including:
1. Rotational kinematics equations relating angular displacement (θ), angular velocity (ω), angular acceleration (α), and time (t).
2. Rotational dynamics equations relating torque (τ), moment of inertia (I), angular acceleration (α), and angular velocity (ω).
3. Examples calculating values like angular velocity, angular acceleration, linear velocity, torque, power, work, and kinetic energy for rotating objects using the rotational kinematics and dynamics equations.
This document discusses concepts in mechanics including:
1. Conditions for static equilibrium, including that the net force and net torque must equal zero.
2. Analysis of forces in different mechanical systems using free body diagrams and applying Newton's laws and principles of torque.
3. Problem solving techniques for calculating unknown forces, torques or accelerations given force diagrams and relevant equations of motion.
1. SchoolDD.com provides information about heat transfer and calorimetry. It explains key concepts like specific heat capacity, latent heat of fusion and vaporization, and uses equations like Q=mcΔT.
2. Examples are given to calculate the heat transfer involved in changing temperatures of substances. Specific heat values are provided for various materials at different phases.
3. Phase changes from solid to liquid to gas are explained, along with the concept of latent heat absorbed or released without changing temperature during these phase transitions.
This document discusses fluid dynamics and pressure. It defines density, pressure, and hydrostatic pressure. It provides examples of calculating hydrostatic pressure at different depths in fluids of varying densities. Formulas are given for calculating force, pressure, volume, and flow rate. Examples are worked through applying these formulas and concepts to problems involving submerged surfaces, fluids with different densities, and flow through pipes.
This document discusses electric current and concepts related to electricity. It contains the following key points:
1. Electric current is the flow of electric charge in a conductor. The direction of the flow is from higher electric potential to lower electric potential.
2. The factors that affect the magnitude of electric current include the amount of charge passing through a point in the conductor per unit time, and the resistance of the conductor.
3. Kirchhoff's laws relate the current and potential difference in different parts of an electric circuit.
Capítulo 07 falha por fadiga resultante de carregamento variávelJhayson Carvalho
The document provides calculations and solutions to example problems related to fatigue design and analysis. It includes determining endurance limits, fatigue stress concentrations, Goodman diagrams, and calculating fatigue life. Key equations from chapters 3, 7, 8, and the appendix are applied to examples involving shafts, beams, and other mechanical components made from various steel alloys. Material properties, load conditions, and geometric factors are considered to iteratively size components and check designs for sufficient fatigue life.
This document provides calculations and design considerations for sizing a flat belt drive system. It begins by giving parameters for the system including angular velocity ratio, nominal horsepower, pulley center distance, stiffness, and material properties. Initial calculations are shown to check for developed friction. The document then considers doubling the system size as a design task and provides the scaled calculations. It next shows a sample design process for selecting a belt width to meet the specified horsepower requirements. Finally, it solves for several values related to the maximum torque and slip conditions for the belt drive.
This document provides equations and calculations for determining the mean cycles to failure (x-bar) and standard deviation of cycles to failure (s_x) for a sample of fatigue test data. The sample data consists of the number of cycles to failure (x) and applied force (f) for 10 tests. The mean x-bar is calculated as the sum of the product of f and x divided by the sum of f, which equals 122.9 kcycles. The standard deviation s_x is calculated using the variance formula, which equals 30.3 kcycles.
1. The website www.schoolDD.com provides information about electricity and circuits. It explains basic concepts like current, voltage, conductors and insulators.
2. Circuits are explained, along with series and parallel circuits. Key characteristics of each circuit type are defined.
3. Electric fields are also covered, defining concepts such as point charges and the Coulomb force law to calculate electric force. Examples of calculations are provided.
This document discusses various topics relating to electromagnetic waves and radio communication technologies:
1. It describes the properties and characteristics of electromagnetic waves, including wavelength, frequency, and speed.
2. It explains different modulation techniques used in radio transmission, including amplitude modulation (AM) and frequency modulation (FM).
3. It provides an overview of the electromagnetic spectrum, showing the range of wavelengths and frequencies used for radio communication technologies.
This document discusses electric current and concepts related to electricity. It contains the following key points:
1. Electric current is the flow of electric charge in a conductor. The direction of the flow is from higher electric potential to lower electric potential.
2. The factors that affect the magnitude of electric current include the amount of charge passing through a point in the conductor per unit time, and the resistance of the conductor.
3. Kirchhoff's laws relate the current and voltage in different parts of an electrical circuit. Ohm's law defines the relationship between current, voltage, and resistance for a particular circuit.
This document provides information about fluid statics and fluid dynamics. It defines density, calculates the density of a spherical object, and derives equations for pressure due to depth in a fluid. Examples are given for calculating pressure, force, and height in various fluid static scenarios. Fluid flow concepts such as viscosity, shear stress, and drag force are also introduced. An example problem calculates the drag force on a sphere moving through a fluid.
1. The document discusses concepts related to optics such as reflection, refraction, and lenses. It defines terms like focal length and radius and shows equations relating these concepts.
2. Diagrams and equations are provided to demonstrate the relationships between an object's position, image position, and lens or mirror curvature during reflection and refraction. Reflection and refraction rules are explained.
3. Lensmaker's equation and other formulas are given to calculate focal length based on the radius of the lens and the refractive indices of the lens and surrounding media. The behavior of light rays through spherical lenses is analyzed.
The document describes diffraction gratings and the diffraction of light. It contains the following key points:
1) Light passing through a diffraction grating will diffract into discrete angles based on the grating's spacing and the wavelength of light. The diffraction angles follow specific mathematical relationships.
2) Examples are provided to demonstrate calculating diffraction angles and wavelengths using these relationships for different grating spacings and wavelengths of incident light.
3) Different cases are examined for transmission and reflection gratings, and the equations for calculating diffraction angles and wavelengths are given for each case.
1. The document discusses the physics of sound waves, including speed of sound, frequency, wavelength, and how these properties relate through equations.
2. Examples are provided to demonstrate calculating speed, frequency, and wavelength in different scenarios, as well as how observed properties change based on the motion of the source and observer.
3. Key concepts covered include the relationship between speed, frequency, and wavelength, and how the Doppler effect changes the observed frequency based on relative motion between source and observer.
1. The document provides examples of solving physics problems involving momentum and impulse using equations such as the momentum equation (∑p=∑p), the impulse-momentum theorem (Δp=FΔt), and kinematic equations.
2. Various problems are worked through step-by-step involving calculating momentum, impulse, force, velocity, and time in collisions or situations with applied forces.
3. The last examples involve solving for velocities in situations with two objects colliding or interacting, using the principle of conservation of momentum (∑p=∑p).
1. The document discusses standing waves on a string fixed at both ends.
2. The locations of antinodes (An) and nodes (Nn) are determined by the path difference formula, where the path difference must be equal to integer or half-integer wavelengths.
3. Several examples are given of calculating the specific antinode or node locations based on given string lengths (s1 and s2) from one end.
1. This document provides information on mechanics, including forces, moments, equilibrium conditions, stress, strain, and Young's modulus. It includes 13 examples applying these concepts to solve mechanics problems.
2. Key concepts covered include Newton's laws of motion, torque, conditions for translational and rotational equilibrium, definitions of stress and strain, and the relationship between stress, strain, and Young's modulus.
3. Formulas and step-by-step solutions are provided for problems involving forces, torques, stress, strain, and material properties.
1) A student analyzed various physical situations involving forces and calculated work. This included forces acting at angles, forces balanced by friction, and free body diagrams.
2) Key calculations determined work as the product of force and distance (W=Fs), resolving forces into components, and using kinematic equations.
3) The student correctly calculated the work values for different example problems involving multiple forces, inclines, and friction.
The document discusses concepts related to kinematics including displacement (s), velocity (v), acceleration (a), and time (t). Various kinematics equations are presented and worked examples are provided to calculate values like average velocity (vav) and average acceleration (aav) given information about displacement, initial/final velocities, and time. Graphs are also used to represent relationships between variables and derive slope and equations of lines.
This document discusses concepts related to the gas laws including:
1. Definitions of key terms like pressure, volume, temperature, moles, and the gas constant R.
2. Equations relating these variables like the ideal gas law PV=nRT and how pressure, volume, and temperature are directly proportional while temperature and moles are directly proportional.
3. Explanations of how the gas laws can be used to calculate heat, work, internal energy, and other thermodynamic properties of gases.
1. The document defines angular displacement (θ), angular velocity (ω), and angular acceleration (α) and provides equations relating them.
2. Equations of motion are given for linear and angular variables including relationships between displacement (s), velocity (v), acceleration (a), angular displacement (θ), angular velocity (ω), and angular acceleration (α).
3. Formulas are provided for torque (τ), moment of inertia (I), and kinetic energy (Ek) in rotational motion. Sample problems are worked through applying these concepts and equations.
1) The document discusses concepts related to electricity including direct current (DC), alternating current (AC), transformers, and power calculations.
2) It explains Faraday's law of induction and how changing magnetic fields can induce electromotive forces and currents.
3) Formulas are provided for calculating power in DC circuits, current and voltage ratios in transformers, and the relationships between current, voltage, and power in AC circuits.
1. The document discusses projectile motion equations and concepts such as displacement, velocity, acceleration due to gravity, and time of flight. Equations for displacement, velocity, and time of flight are presented.
2. Examples are given of calculating time of flight, maximum displacement, velocity, and angle of projection for various projectile motion scenarios involving different initial velocities and angles.
3. Centripetal force is introduced and explained in terms of force, mass, velocity, radius, period, frequency, and angular velocity. Equations relating these quantities are provided.
The document provides tips and information about radioactive decay and half-life calculations in 3 sections. It defines key concepts like activity, half-life, and decay equations. Examples are given for common radioactive isotopes like Co-60 and I-131. Steps are outlined for calculations involving initial activity, remaining activity, and decay over time. Nuclear reactions and mass-energy equivalence are also briefly discussed.
The document is about basic physics concepts related to kinetic energy. It contains three main points:
1) It defines kinetic energy (EK) as the energy an object possesses due to its motion, and explains that kinetic energy can be calculated as EK = 1/2 mv^2, where m is the object's mass and v is its velocity.
2) It discusses the relationship between an object's maximum kinetic energy (EKmax) and its maximum velocity (vmax), explaining that EKmax occurs when an object's velocity is at its highest point (vmax).
3) It provides an example calculation of converting between units of kinetic energy, showing how to convert from joules to electron
1. The document discusses simple harmonic motion (SHM) and wave motion. It provides equations and graphs relating to SHM and defines terms like amplitude, wavelength, frequency, and period.
2. Examples are given to demonstrate how to use the wave equation to calculate velocity, frequency, and wavelength given other variable values.
3. Reflection of waves is described and examples show how to use trigonometry to relate angles of incidence and reflection to wavelength and velocity of waves.
1. This document discusses concepts of work, energy, and power in mechanics. It provides examples of calculating work done by forces, kinetic energy, potential energy, and power for various systems.
2. Formulas and concepts are explained for work, kinetic energy, gravitational potential energy, elastic potential energy, and the work-energy theorem.
3. Several multi-part word problems are worked through step-by-step applying these formulas and concepts to calculate requested values like work, energy, acceleration, distance, and power. Diagrams accompany some examples.
This document discusses electric circuits and concepts related to current, voltage, and resistance. It contains the following key points:
1. It defines basic circuit concepts like current, charge, drift velocity, and explains how current is related to charge, time, and resistance.
2. It provides formulas for calculating current, charge, and resistance and applies them in examples. Current is calculated using charge divided by time. Resistance depends on resistivity, length, and cross-sectional area of a material.
3. It discusses series and parallel circuits, explaining how current and voltage are distributed in each type. In series circuits, current is the same but voltage adds up. In parallel, voltage is the same but current splits
1. The website www.schoolDD.com provides information about electricity and circuits. It explains basic concepts like current, voltage, conductors and insulators.
2. Circuits are explained, along with series and parallel circuits. Key characteristics of each circuit type are defined.
3. Electric fields are also covered, defining concepts such as point charges and the Coulomb force law to calculate electric force. Examples of calculations are provided.
This document discusses various topics relating to electromagnetic waves and radio communication technologies:
1. It describes the properties and characteristics of electromagnetic waves, including wavelength, frequency, and speed.
2. It explains different modulation techniques used in radio transmission, including amplitude modulation (AM) and frequency modulation (FM).
3. It provides an overview of the electromagnetic spectrum, showing the range of wavelengths and frequencies used for radio communication technologies.
This document discusses electric current and concepts related to electricity. It contains the following key points:
1. Electric current is the flow of electric charge in a conductor. The direction of the flow is from higher electric potential to lower electric potential.
2. The factors that affect the magnitude of electric current include the amount of charge passing through a point in the conductor per unit time, and the resistance of the conductor.
3. Kirchhoff's laws relate the current and voltage in different parts of an electrical circuit. Ohm's law defines the relationship between current, voltage, and resistance for a particular circuit.
This document provides information about fluid statics and fluid dynamics. It defines density, calculates the density of a spherical object, and derives equations for pressure due to depth in a fluid. Examples are given for calculating pressure, force, and height in various fluid static scenarios. Fluid flow concepts such as viscosity, shear stress, and drag force are also introduced. An example problem calculates the drag force on a sphere moving through a fluid.
1. The document discusses concepts related to optics such as reflection, refraction, and lenses. It defines terms like focal length and radius and shows equations relating these concepts.
2. Diagrams and equations are provided to demonstrate the relationships between an object's position, image position, and lens or mirror curvature during reflection and refraction. Reflection and refraction rules are explained.
3. Lensmaker's equation and other formulas are given to calculate focal length based on the radius of the lens and the refractive indices of the lens and surrounding media. The behavior of light rays through spherical lenses is analyzed.
The document describes diffraction gratings and the diffraction of light. It contains the following key points:
1) Light passing through a diffraction grating will diffract into discrete angles based on the grating's spacing and the wavelength of light. The diffraction angles follow specific mathematical relationships.
2) Examples are provided to demonstrate calculating diffraction angles and wavelengths using these relationships for different grating spacings and wavelengths of incident light.
3) Different cases are examined for transmission and reflection gratings, and the equations for calculating diffraction angles and wavelengths are given for each case.
1. The document discusses the physics of sound waves, including speed of sound, frequency, wavelength, and how these properties relate through equations.
2. Examples are provided to demonstrate calculating speed, frequency, and wavelength in different scenarios, as well as how observed properties change based on the motion of the source and observer.
3. Key concepts covered include the relationship between speed, frequency, and wavelength, and how the Doppler effect changes the observed frequency based on relative motion between source and observer.
1. The document provides examples of solving physics problems involving momentum and impulse using equations such as the momentum equation (∑p=∑p), the impulse-momentum theorem (Δp=FΔt), and kinematic equations.
2. Various problems are worked through step-by-step involving calculating momentum, impulse, force, velocity, and time in collisions or situations with applied forces.
3. The last examples involve solving for velocities in situations with two objects colliding or interacting, using the principle of conservation of momentum (∑p=∑p).
1. The document discusses standing waves on a string fixed at both ends.
2. The locations of antinodes (An) and nodes (Nn) are determined by the path difference formula, where the path difference must be equal to integer or half-integer wavelengths.
3. Several examples are given of calculating the specific antinode or node locations based on given string lengths (s1 and s2) from one end.
1. This document provides information on mechanics, including forces, moments, equilibrium conditions, stress, strain, and Young's modulus. It includes 13 examples applying these concepts to solve mechanics problems.
2. Key concepts covered include Newton's laws of motion, torque, conditions for translational and rotational equilibrium, definitions of stress and strain, and the relationship between stress, strain, and Young's modulus.
3. Formulas and step-by-step solutions are provided for problems involving forces, torques, stress, strain, and material properties.
1) A student analyzed various physical situations involving forces and calculated work. This included forces acting at angles, forces balanced by friction, and free body diagrams.
2) Key calculations determined work as the product of force and distance (W=Fs), resolving forces into components, and using kinematic equations.
3) The student correctly calculated the work values for different example problems involving multiple forces, inclines, and friction.
The document discusses concepts related to kinematics including displacement (s), velocity (v), acceleration (a), and time (t). Various kinematics equations are presented and worked examples are provided to calculate values like average velocity (vav) and average acceleration (aav) given information about displacement, initial/final velocities, and time. Graphs are also used to represent relationships between variables and derive slope and equations of lines.
This document discusses concepts related to the gas laws including:
1. Definitions of key terms like pressure, volume, temperature, moles, and the gas constant R.
2. Equations relating these variables like the ideal gas law PV=nRT and how pressure, volume, and temperature are directly proportional while temperature and moles are directly proportional.
3. Explanations of how the gas laws can be used to calculate heat, work, internal energy, and other thermodynamic properties of gases.
1. The document defines angular displacement (θ), angular velocity (ω), and angular acceleration (α) and provides equations relating them.
2. Equations of motion are given for linear and angular variables including relationships between displacement (s), velocity (v), acceleration (a), angular displacement (θ), angular velocity (ω), and angular acceleration (α).
3. Formulas are provided for torque (τ), moment of inertia (I), and kinetic energy (Ek) in rotational motion. Sample problems are worked through applying these concepts and equations.
1) The document discusses concepts related to electricity including direct current (DC), alternating current (AC), transformers, and power calculations.
2) It explains Faraday's law of induction and how changing magnetic fields can induce electromotive forces and currents.
3) Formulas are provided for calculating power in DC circuits, current and voltage ratios in transformers, and the relationships between current, voltage, and power in AC circuits.
1. The document discusses projectile motion equations and concepts such as displacement, velocity, acceleration due to gravity, and time of flight. Equations for displacement, velocity, and time of flight are presented.
2. Examples are given of calculating time of flight, maximum displacement, velocity, and angle of projection for various projectile motion scenarios involving different initial velocities and angles.
3. Centripetal force is introduced and explained in terms of force, mass, velocity, radius, period, frequency, and angular velocity. Equations relating these quantities are provided.
The document provides tips and information about radioactive decay and half-life calculations in 3 sections. It defines key concepts like activity, half-life, and decay equations. Examples are given for common radioactive isotopes like Co-60 and I-131. Steps are outlined for calculations involving initial activity, remaining activity, and decay over time. Nuclear reactions and mass-energy equivalence are also briefly discussed.
The document is about basic physics concepts related to kinetic energy. It contains three main points:
1) It defines kinetic energy (EK) as the energy an object possesses due to its motion, and explains that kinetic energy can be calculated as EK = 1/2 mv^2, where m is the object's mass and v is its velocity.
2) It discusses the relationship between an object's maximum kinetic energy (EKmax) and its maximum velocity (vmax), explaining that EKmax occurs when an object's velocity is at its highest point (vmax).
3) It provides an example calculation of converting between units of kinetic energy, showing how to convert from joules to electron
1. The document discusses simple harmonic motion (SHM) and wave motion. It provides equations and graphs relating to SHM and defines terms like amplitude, wavelength, frequency, and period.
2. Examples are given to demonstrate how to use the wave equation to calculate velocity, frequency, and wavelength given other variable values.
3. Reflection of waves is described and examples show how to use trigonometry to relate angles of incidence and reflection to wavelength and velocity of waves.
1. This document discusses concepts of work, energy, and power in mechanics. It provides examples of calculating work done by forces, kinetic energy, potential energy, and power for various systems.
2. Formulas and concepts are explained for work, kinetic energy, gravitational potential energy, elastic potential energy, and the work-energy theorem.
3. Several multi-part word problems are worked through step-by-step applying these formulas and concepts to calculate requested values like work, energy, acceleration, distance, and power. Diagrams accompany some examples.
This document discusses electric circuits and concepts related to current, voltage, and resistance. It contains the following key points:
1. It defines basic circuit concepts like current, charge, drift velocity, and explains how current is related to charge, time, and resistance.
2. It provides formulas for calculating current, charge, and resistance and applies them in examples. Current is calculated using charge divided by time. Resistance depends on resistivity, length, and cross-sectional area of a material.
3. It discusses series and parallel circuits, explaining how current and voltage are distributed in each type. In series circuits, current is the same but voltage adds up. In parallel, voltage is the same but current splits
1) The document provides various physics constants and formulas.
2) Example calculations are shown such as calculating the work done by a force and solving kinematics equations.
3) Physics concepts involving forces, kinematics, energy, and circuits are demonstrated.
1) The document provides various physics constants and formulas.
2) Example calculations are shown such as calculating the work done by a force and solving mechanics problems involving forces, displacement, velocity, and acceleration.
3) Formulas are applied to calculate values such as time, velocity, displacement, work, and more.
This document provides information about units, prefixes, and formulas in the metric system. It includes:
1. Explanations of the seven base SI units - meter, kilogram, second, ampere, kelvin, mole, and candela.
2. Descriptions of the prefixes used to denote powers of ten when multiplying or dividing units, such as kilo (103) and milli (10-3).
3. Examples of calculations using prefixes to convert between units, like converting 4,700,000,000 meters to 4,700 kilometers.
The document also contains sections on error analysis in measurements, kinematic formulas, and dimensional analysis.
This document provides information about units, prefixes, and scientific notation used in the metric system. It defines the seven base SI units for mass, length, time, electric current, temperature, amount of substance, and luminous intensity. It also describes the prefixes that are multiplied with the base units to indicate decimal multiples and submultiples, such as kilo, mega, milli, and micro. Several examples are provided to demonstrate converting between numeric values and scientific notation with prefixes.
1. The document discusses the principles of refraction of light, including Snell's law and the relationship between the indices of refraction and angles of incidence and refraction.
2. Examples are provided to demonstrate calculating unknown values like angles and speeds given information about the indices of refraction of different media and angles of incidence or refraction.
3. The final examples show using Snell's law and relationships between trigonometric functions to calculate unknown values like the distance between two points when the refractive indices and angles are known.
1. The document provides information about physics formulas and concepts including equations for force, motion, energy, waves, electricity, and more.
2. Key formulas and values given include g = 9.8 m/s^2, π = 3.14159, trigonometric identities, equations for forces on two masses connected by a string, kinetic and potential energy, simple harmonic motion, magnetic force, resistance, sound intensity, diffraction, and gas laws.
3. Examples are worked through applying the given formulas to calculate values for forces, velocities, distances, wavelengths, power, pressure changes, and resistance.
1. This document contains mathematical formulas and definitions across multiple topics.
2. Sections are divided into numbered problems and include formulas, sets, functions, limits, and other mathematical concepts.
3. The document tests understanding of diverse mathematical domains.
1. This document contains mathematical formulas and definitions across multiple topics.
2. Sections include logical statements, set theory concepts, functions, trigonometric identities, and algebraic equations.
3. Various problems are presented involving limits, series, geometry, and other quantitative reasoning questions.
1. This document contains mathematical formulas and definitions across multiple topics.
2. Sections include logical statements, set theory concepts, functions, trigonometric identities, and algebraic equations.
3. Various problems are presented involving limits, series, geometry, and other calculus and mathematical analysis concepts.
1. This document contains mathematical formulas and definitions across multiple topics.
2. Sections include logical statements, set theory concepts, functions, trigonometric identities, and algebraic equations.
3. Various problems are presented involving limits, series, geometry, and other calculus and mathematical analysis concepts.
1. The document contains 25 multiple choice questions about mathematics and statistics.
2. The questions cover a range of topics including sets, functions, algebra, trigonometry, matrices, limits, and probability.
3. Many questions involve analyzing relationships between mathematical expressions, solving equations, interpreting graphs or data, or applying statistical formulas.
1. The document contains multiple math and logic problems involving sets, functions, equations, inequalities, and limits.
2. Many problems require determining properties of functions, solving equations and inequalities, evaluating limits, and performing calculations with sets, matrices, and complex numbers.
3. The last few problems involve calculating percentages, fitting linear equations to data sets, and predicting values based on linear trends.
This document provides information about electric fields and potential. Key points include:
- Electric field strength E is defined as force per unit charge, and depends on the charge Q and distance r from the charge as E=kQ/r^2
- Electric potential V at a point is defined as the work required to move a unit positive charge from infinity to that point without acceleration, and depends on charge Q and distance r as V=kQ/r
- Electric potential difference ΔV between two points is equal to the work required per unit charge to move the charge between those points.
The document discusses basic number theory concepts including:
1) Definitions of divisibility and greatest common divisor (GCD) of two numbers.
2) An algorithm called the Euclidean algorithm to calculate the GCD of two numbers.
3) Introduction to least common multiple (LCM) of two numbers and a method to calculate LCM using prime factorizations.
This document discusses electromagnetic waves and their properties. It covers:
1. The electromagnetic spectrum ranging from radio waves to gamma rays and their wavelengths.
2. How electromagnetic waves propagate through space as oscillating electric and magnetic fields.
3. Different methods of modulating waves, such as amplitude modulation and frequency modulation, and their uses in radio broadcasting.
4. Applications of electromagnetic waves including wireless communication, medical imaging, fiber optics, and lasers.
1. The document discusses rotational motion concepts including tangential velocity, angular acceleration, centripetal force, and orbital motion.
2. Equations for tangential velocity, centripetal force, and orbital motion are presented and applied to example problems involving objects rotating in circular orbits.
3. Key values calculated in examples include tangential velocities of 4 m/s, 10.5 degrees for an angle of rotation, centripetal forces of 2,778 N and 3,100 N, and an orbital velocity of 463 m/s.
1. The document presents several mathematical concepts and problems involving functions, sets, inequalities, limits, and matrices.
2. Key concepts covered include properties of functions, set operations and relations, solving systems of equations, and taking limits of sequences and functions.
3. A variety of problem types are provided involving evaluating expressions, solving equations, finding domains/ranges, and determining limits.
1. The document discusses properties of real number systems based on Peano's postulates. It defines concepts like rational and irrational numbers, integers, and describes properties such as closure under addition and multiplication.
2. Bounded and unbounded sets are defined, and properties of the supremum and infimum of sets are explained. The trichotomy property of real numbers and relationships between supremums and infimums are also covered.
3. Operations on sets like multiplying a set by a scalar and taking the union of two sets are examined. Properties like how these operations affect supremums and infimums are described.
EWOCS-I: The catalog of X-ray sources in Westerlund 1 from the Extended Weste...Sérgio Sacani
Context. With a mass exceeding several 104 M⊙ and a rich and dense population of massive stars, supermassive young star clusters
represent the most massive star-forming environment that is dominated by the feedback from massive stars and gravitational interactions
among stars.
Aims. In this paper we present the Extended Westerlund 1 and 2 Open Clusters Survey (EWOCS) project, which aims to investigate
the influence of the starburst environment on the formation of stars and planets, and on the evolution of both low and high mass stars.
The primary targets of this project are Westerlund 1 and 2, the closest supermassive star clusters to the Sun.
Methods. The project is based primarily on recent observations conducted with the Chandra and JWST observatories. Specifically,
the Chandra survey of Westerlund 1 consists of 36 new ACIS-I observations, nearly co-pointed, for a total exposure time of 1 Msec.
Additionally, we included 8 archival Chandra/ACIS-S observations. This paper presents the resulting catalog of X-ray sources within
and around Westerlund 1. Sources were detected by combining various existing methods, and photon extraction and source validation
were carried out using the ACIS-Extract software.
Results. The EWOCS X-ray catalog comprises 5963 validated sources out of the 9420 initially provided to ACIS-Extract, reaching a
photon flux threshold of approximately 2 × 10−8 photons cm−2
s
−1
. The X-ray sources exhibit a highly concentrated spatial distribution,
with 1075 sources located within the central 1 arcmin. We have successfully detected X-ray emissions from 126 out of the 166 known
massive stars of the cluster, and we have collected over 71 000 photons from the magnetar CXO J164710.20-455217.
The technology uses reclaimed CO₂ as the dyeing medium in a closed loop process. When pressurized, CO₂ becomes supercritical (SC-CO₂). In this state CO₂ has a very high solvent power, allowing the dye to dissolve easily.
ESA/ACT Science Coffee: Diego Blas - Gravitational wave detection with orbita...Advanced-Concepts-Team
Presentation in the Science Coffee of the Advanced Concepts Team of the European Space Agency on the 07.06.2024.
Speaker: Diego Blas (IFAE/ICREA)
Title: Gravitational wave detection with orbital motion of Moon and artificial
Abstract:
In this talk I will describe some recent ideas to find gravitational waves from supermassive black holes or of primordial origin by studying their secular effect on the orbital motion of the Moon or satellites that are laser ranged.
Authoring a personal GPT for your research and practice: How we created the Q...Leonel Morgado
Thematic analysis in qualitative research is a time-consuming and systematic task, typically done using teams. Team members must ground their activities on common understandings of the major concepts underlying the thematic analysis, and define criteria for its development. However, conceptual misunderstandings, equivocations, and lack of adherence to criteria are challenges to the quality and speed of this process. Given the distributed and uncertain nature of this process, we wondered if the tasks in thematic analysis could be supported by readily available artificial intelligence chatbots. Our early efforts point to potential benefits: not just saving time in the coding process but better adherence to criteria and grounding, by increasing triangulation between humans and artificial intelligence. This tutorial will provide a description and demonstration of the process we followed, as two academic researchers, to develop a custom ChatGPT to assist with qualitative coding in the thematic data analysis process of immersive learning accounts in a survey of the academic literature: QUAL-E Immersive Learning Thematic Analysis Helper. In the hands-on time, participants will try out QUAL-E and develop their ideas for their own qualitative coding ChatGPT. Participants that have the paid ChatGPT Plus subscription can create a draft of their assistants. The organizers will provide course materials and slide deck that participants will be able to utilize to continue development of their custom GPT. The paid subscription to ChatGPT Plus is not required to participate in this workshop, just for trying out personal GPTs during it.
PPT on Direct Seeded Rice presented at the three-day 'Training and Validation Workshop on Modules of Climate Smart Agriculture (CSA) Technologies in South Asia' workshop on April 22, 2024.
The cost of acquiring information by natural selectionCarl Bergstrom
This is a short talk that I gave at the Banff International Research Station workshop on Modeling and Theory in Population Biology. The idea is to try to understand how the burden of natural selection relates to the amount of information that selection puts into the genome.
It's based on the first part of this research paper:
The cost of information acquisition by natural selection
Ryan Seamus McGee, Olivia Kosterlitz, Artem Kaznatcheev, Benjamin Kerr, Carl T. Bergstrom
bioRxiv 2022.07.02.498577; doi: https://doi.org/10.1101/2022.07.02.498577
When I was asked to give a companion lecture in support of ‘The Philosophy of Science’ (https://shorturl.at/4pUXz) I decided not to walk through the detail of the many methodologies in order of use. Instead, I chose to employ a long standing, and ongoing, scientific development as an exemplar. And so, I chose the ever evolving story of Thermodynamics as a scientific investigation at its best.
Conducted over a period of >200 years, Thermodynamics R&D, and application, benefitted from the highest levels of professionalism, collaboration, and technical thoroughness. New layers of application, methodology, and practice were made possible by the progressive advance of technology. In turn, this has seen measurement and modelling accuracy continually improved at a micro and macro level.
Perhaps most importantly, Thermodynamics rapidly became a primary tool in the advance of applied science/engineering/technology, spanning micro-tech, to aerospace and cosmology. I can think of no better a story to illustrate the breadth of scientific methodologies and applications at their best.
The debris of the ‘last major merger’ is dynamically youngSérgio Sacani
The Milky Way’s (MW) inner stellar halo contains an [Fe/H]-rich component with highly eccentric orbits, often referred to as the
‘last major merger.’ Hypotheses for the origin of this component include Gaia-Sausage/Enceladus (GSE), where the progenitor
collided with the MW proto-disc 8–11 Gyr ago, and the Virgo Radial Merger (VRM), where the progenitor collided with the
MW disc within the last 3 Gyr. These two scenarios make different predictions about observable structure in local phase space,
because the morphology of debris depends on how long it has had to phase mix. The recently identified phase-space folds in Gaia
DR3 have positive caustic velocities, making them fundamentally different than the phase-mixed chevrons found in simulations
at late times. Roughly 20 per cent of the stars in the prograde local stellar halo are associated with the observed caustics. Based
on a simple phase-mixing model, the observed number of caustics are consistent with a merger that occurred 1–2 Gyr ago.
We also compare the observed phase-space distribution to FIRE-2 Latte simulations of GSE-like mergers, using a quantitative
measurement of phase mixing (2D causticality). The observed local phase-space distribution best matches the simulated data
1–2 Gyr after collision, and certainly not later than 3 Gyr. This is further evidence that the progenitor of the ‘last major merger’
did not collide with the MW proto-disc at early times, as is thought for the GSE, but instead collided with the MW disc within
the last few Gyr, consistent with the body of work surrounding the VRM.
2. – F ˆ F www.schoolDD.com 1
3
F ˈ F F
F F ˈ ˈ F F
F F F ˈ F F F
F
3.1 ,
F ʽ F F F F F
F F F ˈ F F 45 F F F
45 450 F ʽ F
(Force) F F F F F
F F F F
ˈ F ˈ F F ˈ (N)
(Mass) m F ˈ F F ˈ
(kg)
F F F
F F F
F ˈ
u = 0
F
v
ˈ
v1
F
v2
F v1 ˈ v2
F
3. – F ˆ F www.schoolDD.com 2
(Weight) w F F m
F F g F g F F F F
F ˈ (N)
F
F x - y
ˈ F
F θ x F x F F F
F 1 x F F cosθ F y F
2 F F sinθ F F F F F cosθ F F
F F sinθ .... F F α y F F α F
F F F F F.. F F θ = 30°, α = 60° ( F F cos30° =
F sin 60° F sin 30° = F cos60° ?) ʿ F F !
m
W = mg
“ F ”
F
- ˈ (= )
- F F F F F F
F F F g F
- ˈ F F F F F F
F 2
θ
F
y
F cosθ
x
F sinθ
1
2
F F x F cos θ
F F y F sin θ
F
- ˈ F F F F ˈ
F ( ) F F F
- F F F ˈ F
F F F
4. – F ˆ F www.schoolDD.com 3
F sin , cos , tan F
F sin , cos , tan F F F 30°, 60°, 37°, 53° 45°
F sin , cos , tan F F F F F F
F F F F F F ˆ F F F F
F F F ˈ F
F F sin , cos , tan F F
F F F F ʿ ʿ F F F F F
ˈ F F F
F F F ˈ 30°, 60°, 37°,
53° 45°
F F F sin , cos , tan 30°, 60°, 37°,
53° 45° F F F F F
θ
F F ˈ
θ
a
c 1
2
F sinθ F F 1՜2 F F
F sinθ = a/c
θ
b
c
3
4 F cosθ F F 3՜4 F F
F cosθ = b/c
30
60
1
2
√3
37
53
5
4
3
45
45
1
1
√2
F tanθ F F 5՜6 F F
F tanθ = a/b
θ
a
b
5
6
5. – F ˆ F www.schoolDD.com 4
F 1
F1 = 3 N F2 = 4 N m F
.
ˈ +
F F = F1 - F2
= 3 - 4
= - 1 ( F F F F )
∴ F 1 N F Ans
.
F2 ˈ x y F F1 F
x ΣFx = F1 + F2 cos60
= 3 + 4 (½)
= 5 N
y ΣFy = F2 sin60
= 4 ሺ
√ଷ
ଶ
ሻ
= 2√3 N
F F = ඥΣFxଶ Fyଶ
= ට5ଶ ሺ2ඥ3ሻ
ଶ
= 6.08 N
m
F2 F1
m
60° F1
F2
F1 F2 cos60
60°
F2 sin60
x
y
F2
α x
y
ΣFX
ΣFy
F F
6. – F ˆ F www.schoolDD.com 5
∴ F 6.08 N Ans
F F tan α =
Σ ౯
Σ ౮
=
ଶ√ଷ
ହ
= 0.7
∴ α = tan-1
0.7 Ans
.
F F = F1 + F2
= 3 + 4
= 7 N
∴ F 7 N Ans
3.2
F (Sir Issac Newton) ʽ F F
F F ˈ F F
F F 3 F
3 F
F 1 F F F F
m
F1
F2
F 1 F F
F F F ˈ F F
F 2 F F F ˈ F F F F
F F
F
F 3 Action = Reaction F F F
F
∑ F = 0
F
m
V , a = 0
m
V = 0 , a = 0
7. – F ˆ F www.schoolDD.com 6
F F
ˈ F F F
F 2 F F F ˈ F F F F F
F F F F ∑ ܨ F F F a F ∑ ܨ = ma
F 3 Action = Reaction F F F F F12 F
F21 F F
F F
F F F
F F ?
F F F F ˈ F ?
F F ?
F F F F a F g
F12 = F21
F21 F12
F
- F F 3 F F F F
F F ˂ F ˈ F
- 3 F ˈ F F F F F
F 3 F F F F ( F F ..?) F F
F F F F F F F F F
F
∑ F = ma
F F ˈ F
m
a
∑ F
8. – F ˆ F www.schoolDD.com 7
F 2
F 20 kg F F F 24 m/s
8
F.. F F F F F F F F F
F F ˈ F F”
F F F F F 2 ∑ F = ma
F ∑ F F F F
F ∑ F = F F = ma --- (1)
F F F m F F a ∴ F a F
F a F v = u + at ( )
24 = 0 + a (8)
a = 3 m/s2
F a = 3 (1) F
F = 20 (3)
∴ F = 60 N Ans
F = ?
m m
u = 0 ( F ) v = 24 m/s
t = 8 s
m = 20 kg
F
- F F F 2 F F F ˆ F
F ˈ F ʽ F F F F F
F F F F F F F
F F F F F ʽ F F F
9. – F ˆ F www.schoolDD.com 8
F 3
5 kg ˂ 100 m F
F ∑ F = ma
F F = m(g)
F = 5(10)
∴ F = 50 N Ans
F 4
200 N F F F 10 m/s2
F F 100 N
F F
F F ∑ F = ma
F F1 = ma1
∴ m =
భ
ୟభ
=
ଶ
10
= 20 kg
F a2 F F ∑ F = ma
F F2 = ma2
∴ a2 =
భ
୫
=
ଵ
20
= 5 m/s2
Ans
F
100 m
a = g
80
m = 5 kg
F = ?
F
- F
m
a1 = 10 m/s2
F1 = 200 N
F
m
a2 = ?
F2 = 100 N
10. – F ˆ F www.schoolDD.com 9
F F ˈ ∑ F = ma
F = ma
m F F F ן a
మ
భ
=
ୟమ
ୟభ
F F
ଵ
ଶ
=
ୟమ
ଵ
∴ a2 = 5 m/s2
Ans
F 5
m1 F F 20 m/s2
m2 F F 5 m/s2
F m1/m2
F ∑ F = ma
F F = m1a1 --- (1)
F = m2a2 --- (2)
(1) = (2) , m1a1 = m2a2
∴
୫భ
୫మ
=
ୟమ
ୟభ
=
ହ
ଶ
=
ଵ
ସ
Ans
F F ˈ ∑ F = ma
F = ma
F F F m ן
ଵ
ୟ
୫భ
୫మ
=
ୟమ
ୟభ
F F
୫భ
୫మ
=
ହ
ଶ
∴
୫భ
୫మ
=
ଵ
ସ
Ans
m1
a1 = 20 m/s2
F
F
m2
a2 = 5 m/s2
F
୫భ
୫మ
= ?
F
- F F F F F ˈ F
F F F ʿ
F F F ˈ ( ) ʿ
F F F
11. – F ˆ F www.schoolDD.com 10
F 6
20 N F F F 10 F
50 m F F
∑ F = ma
F F = ma --- (1)
m F F F F a a F
a F s = ut + ½ at2
( )
50 = 0 + ½ a (102
)
a = 1 m/s2
F a = 1 (1)
F = ma
20 = m(1)
m = 20 kg Ans
F 7
5 kg 6 N 8 N F
∑ F = ma --- (1)
a F m F F ∑ F ∑ F F
F ∑ F 6 N 8 N F
F F
F ”m
s = 50
t = 10F = 20
u = 0 m = ?
m
6 N
5 kg
8 N
F
∑ F = √6ଶ 8ଶ = √100 = 10 N
F
tanߙ =
଼
=
ସ
ଷ
ߙ = 53°
8 N
10 N
6 N
ߙ
12. – F ˆ F www.schoolDD.com 11
F ∑ F = 10 (1)
F a =
∑
୫
=
ଵ
ହ
= 2 m/s2
F 53° 6 N Ans
3.3 (Frictional force)
f F F
F F F F F
F F F
F F F F
F ˈ F
f F F ߤ N
F ˈ 2
1. (Static friction) fs ˈ F
F F F F F F F ˈ
F F ( F )
2. F (Kinetic friction) fk ˈ F
ˈ F.. .. F F
F F F 0... fs (= ߤsN) fs
F F fk (= ߤkN) F F
F F F ˈ F ?
f = ࣆN
f
F
... .. ..
N
ߤ
mg
F
- ߤs > F ߤk
( F F F F .)
- F ˈ F F F
- (ߤsN) > F(ߤkN)
- N
- W = mg F F
13. – F ˆ F www.schoolDD.com 12
F
?
F 8
F 10 kg F F
F 70 N F F F 40 N
. F F
. F F F F
F F F
. fs = ? , ߤs = ?
fs
∑ Fx = max
F fs = max
70 fs = 10(0) ( F ax = 0)
fs = 70 N Ans
ߤs fs = ߤsN --- (1)
∑ Fy = may
N mg = may
N 10(10) = 10(0) ( F ay = 0)
N = 100 N
F N = 100 (1)
fs = ߤsN
70 = ߤs(100)
ߤs = 0.7 Ans
fk = ?
v
F = 40 N
N
mg
ߤk = ?fs = ?
v = 0 F
F = 70 N
N
mg
ߤs =?
m = 10 kg
14. – F ˆ F www.schoolDD.com 13
. fk = ? , ߤk = ?
F F fk
∑ Fx = max
F fk = max
40 fk = 10(0) ( F v ax = 0)
fk = 40 N Ans
F ߤk fk = ߤkN --- (1)
∑ Fy = may
N mg = may
N 10(10) = 10(0) ( F ay = 0)
N = 100 N
F N = 100 (1)
fk = ߤkN
40 = ߤs(100)
ߤk = 0.4 (< ߤs ) Ans
F
- F mg N F
F F F ˈ mg
F F F F N F F
F F F F
F mg N F F ( F ) F
- F ߤs F
mg
N
F F
N
mg
mg
N
15. – F ˆ F www.schoolDD.com 14
F 9
120 kg F F F F 20 m/s F
F 50 m F F
F F u F
u = 20 m/s
F F ( F ) F F
F 2 F F
F F F F
F F F 20 m/s F 1
∑ F = ma
F f = ma --- (1)
f F m F F a a F
a v2
= u2
+ 2as ( )
0 = 202
+ 2a (50)
a = -4 m/s2
(a ˈ F F u)
F a = -4 (1)
f = ma
f = 120 (-4)
f = -480 N ( F F )
F 480 N Ans
F 10
500 N 37° 40 kg F
0.4 F F
F
F F
F ”
u = 20
v = 0
m
s = 50
t = 10
f = ?mm = 120
F F ”
500 N
N37°
16. – F ˆ F www.schoolDD.com 15
F F 500 N F F (x-y)
F
F a
∑ Fx = max
F 500 cos37 - f = ma --- (1)
a F m F F f f F
f = ߤN F ߤ F F N
N
∑ Fy = may
F N + 500 sin37 - mg = may
N + 500(3/5) 40(10) = 0 ( F ay = 0)
N = 100 N
F F f = ߤN = 0.4(100) = 40 N
F f = 40 (1)
500 cos37 - f = ma
500(4/5) - 40 = 40a
a = 9 m/s2
Ans
a = ?500
37°
500 cos37
500 sin37
x
y
f
N
mg
m = 40
ߤ= 0.4
F F .
F ˈ . F F F F
F F F
F F ˈ .
F
- F ∑ F = ma F 2 ∑ F ( F)
F F m F F a F F F
F ∑ F F F F
F F
m
mg
N
f
T F
a
∑ F = ma
F F F = ma
F T f = ma
17. – F ˆ F www.schoolDD.com 16
F 11
F F ˈ F
F ߤs = 1.0 ߤk = 0.80 F θ F F
F F F F F F F
F F F ˆ F F F ˈ
F F ʽ F
θ F F F ˈ F
F
∑ F = ma
F F F = ma
F mg sinθ - fs = ma F a = 0 ( F )
mg sinθ = fs --- (1)
fs fs = µs N F µs F F N
N
∑ F = ma
F N - mg cosθ = ma
N - mg cosθ = 0 ( F a = 0)
N = mg cosθ
“ ˈ F F F
F F F F ˂ 3
w = mg , f
,
N ˈ 2
mg sinθ mg cosθ ”
θ
N
mg sinθ
f
mg cosθ
W = mg
θ
90-θ
θ
F 180 F
18. – F ˆ F www.schoolDD.com 17
F N F fs = µs N = 1.0 mg cosθ = mg cosθ
F fs (1)
mg sinθ = mg cosθ
ୱ୧୬θ
ୡ୭ୱθ
= 1.0
tanθ = 1.0
θ = 45° Ans
F F F F ˈ F
F
∑ F = ma
F F F = ma
F mg sinθ fk = ma
mg sinθ - µk N = ma
mg sinθ - µk (mg cos θ) = ma (N = mg cos ߠ)
10 (
ଵ
√ଶ
) - 0.80 (10)(
ଵ
√ଶ
) = a ( F m F )
a = √2 = 1.414 m/s2
Ans
F 12
90 N 10 kg F F 20 kg F
. F
. F
. F 90 N F 20 kg F
F ˈ F
. F a = ?
∑ F = ma
F
- F F F ˈ F F m F
F F F
F F F F F F F F F F F F F
F F
90 N
10 kg
20 kg
a = ?
F
19. – F ˆ F www.schoolDD.com 18
F F F = ma
m = 10 + 20 = 30 kg ( F ˈ F )
F 90 = 30 (a)
a = 3 m/s2
Ans
. F R
F F F
10 kg
∑ F = ma
F F F = ma
90 - R = 10 (3)
R = 60 N Ans
20 kg
∑ F = ma
F F F = ma
R = 20 (3)
R = 60 N Ans ( F 10 kg)
F F F F F F
.
F a = ?
F R ˈ F - F
F F
F F 3 ”10kg
90 N R
a = 3 m/s2
20 kg
R
a = 3 m/s2
90 N
10 kg
20 kg
a = ?
20. – F ˆ F www.schoolDD.com 19
∑ F = ma
F F F = ma
m = 10 + 20 = 30 kg
F 90 = 30 (a)
a = 3 m/s2
Ans ( F F F F F )
20 kg
∑ F = ma
F F F = ma
90 - R = 20 (3)
R = 30 N Ans ( F F F F .)
10 kg
∑ F = ma
F F F = ma
R = 10 (3)
R = 30 N Ans
20 kg
a = 3 m/s2
R 90 N
10kg
R
a = 3 m/s2
F
- ˈ F mg
N F F F F F
F F ˈ F F F F F F F F
21. – F ˆ F www.schoolDD.com 20
F 13
F 120 N 5 kg 10 kg 15 kg F F
F T1 T2 F µ = 0.10
F a
∑ F = ma
F F F = ma
F F - f1 - f2 - f3 = ma
F - µN1 - µN2 - µN3 = (m1+ m2 + m3)a
120 - µ(N1 + N2 + N3 ) = (15 + 10 + 5)a
120 - 0.1(15(10) + 10(10) + 5(10)) = 30 a ( F N = mg)
a = 3 m/s2
Ans
F T1
15 kg
∑ F = ma
F ”
T1 F F F 10 kg 15 kg 15 kg F m1
15 kg 10 kg 5 kg
T1 T2 F
m1 m2 m3
T1 T2 F
a = ?
f1 f2
N2
m1g m2g m3g
N1 N3
f3µ = 0.10
m1
m1g
f1
T1 = ?
N1
a = 3 m/s2
22. – F ˆ F www.schoolDD.com 21
F F F = ma
F T1 - f1 = m1a
T1 - µN1 = m1a
T1 - µ m1g = m1a
T1 = m1(a + µg)
T1 = 15(3 + 0.1(10))
T1 = 60 N Ans
F T2
5 kg
∑ F = ma
F F F = ma
F F T2 f3 = m3a
F T2 µN3 = m3a
F T2 µ(m3g) = m3a
120 T2 0.1(5x10) = 5(3)
T2 = 100 N Ans
F
- F F F F
F F F F F F
F F F F F F F F
F F F F
m
mg
T
T
T
m
mg
m1 m2
FT
m1 m2
FT T
m3
m3g
N3
f3
T2 = ? F = 120 N
a = 3 m/s2
23. – F ˆ F www.schoolDD.com 22
F 14
80 N 2 kg 3 kg F F F F
F
F a
F ˈ F T F ˈ F
∑ F = ma
F F F = ma
F F m1g m2g = (m1 + m2)a
80 2(10) 3(10) = (2 + 3)a
a = 6 m/s2
Ans
F T
3 kg
3 kg
2 kg
F = 80 N
T a
a = 6 m/s2m2
T = ?
m2g
a = ?
m2
m1
F = 80 N
m1g
m2g
24. – F ˆ F www.schoolDD.com 23
∑ F = ma
F F F = ma
F T m2g = m2a
T 3(10) = 3(6)
T = 48 N Ans
F 15
2 kg 3 kg F F F F F
F F
F a
3 kg F F 2 kg F
F a F F F
∑ F = ma
F F F = ma
F m2g m1g = (m1 + m2)a
3(10) 2(10) = (2 + 3)a
a = 2 m/s2
Ans
F
”
T T
2 3
a = ?a = ? m1 m2
m2gm1g
25. – F ˆ F www.schoolDD.com 24
F
2 kg
∑ F = ma
F F F = ma
F T m1g = m1a
T 2(10) = 2(2)
T = 24 N Ans
F 16
F F F F F F
F a
F m1
∑ F = ma
F F
F a
F F F F
T = ?
a = 2 m/s2
m1
m1g
10 kg
37°
T2
T2
T1
T1
10 kg
15 kg
25 kg
F
10 kg
37°
m2
m3
m1
m2g m2g cos37
m2g sin37
N
m1g
m3g
a
a
a
26. – F ˆ F www.schoolDD.com 25
F F F = ma
F m1g m2g sin37 m3g = (m1 + m2 + m3)a
25(10) 10 (10)(3/5) 15(10) = (25 + 10 + 15)a
a = 0.8 m/s2
Ans
F a ˈ F F a ˈ F
F T1
m1
∑ F = ma
F F F = ma
F m1g T1 = m1a
25(10) T1 = 25(0.8)
T1 = 230 N Ans
F T2
m3
∑ F = ma
F F F = ma
F T2 m3g = m3a
T2 15(10) = 15(0.8)
T2 = 162 N Ans
T1 = ?
a = 0.8 m/s2
m1
m1g
T2 = ?
a = 0.8 m/s2
m3
m3g
27. – F ˆ F www.schoolDD.com 26
3.4
F F F F F F
1 2 F F F F T
3 F F F F F N
F F F F F F ?
F F F F ?
F 17
F 1 kg F F F F F F F
. F
. F
. F
. F F 0.5 m/s2
. F F 0.5 m/s2
F
- F F F F F F
1
m1
T1
T1
T2 = 2T1
1
m2
T1
T2 = T1/2
1
m1
T2 = T1/2
mm = 1 kg
1
mg
T
m
2
m2g
m g
m1g
T
T T
T
m1
m2
3
mg
mm
N
28. – F ˆ F www.schoolDD.com 27
F F F F
. F
F F
∑ F = ma
F F F = ma
F T mg = ma
T 1(10) = 1(0)
T = 10 N ( F ) Ans
. F
F F
∑ F = ma
F F F = ma
F T mg = ma
T 1(10) = 1(0)
T = 10 N ( F ) Ans
. F
F F
m
mg
a = 0
T
m
mg
v , a = 0
T
m
mg
v , a = 0
T
29. – F ˆ F www.schoolDD.com 28
∑ F = ma
F F F = ma
F mg T = ma
1(10) T = 1(0)
T = 10 N ( F ) Ans
. F F 0.5 m/s2
F F
∑ F = ma
F F F = ma
F T mg = ma
T 1(10) = 1(0.5)
T = 10.5 N ( F ) Ans
. F F 0.5 m/s2
F F
∑ F = ma
F F F = ma
F mg T = ma
1(10) T = 1(0.5)
T = 9.5 N ( F F ) Ans
m
mg
a = 0.5 m/s2
T
m
mg
a = 0.5 m/s2
T
30. – F ˆ F www.schoolDD.com 29
F 18
5 kg 15 kg F F F F
F F F F F F F
F F
F 15 kg F 5 kg
F a
∑ F = ma
F F F = ma
F m1g m2g = (m1 + m2) a
15(10) 5(10) = (15 + 5)a
a = 5 m/s2
T
m2
∑ F = ma
F F F = ma
F T m2g = m2a
T 5(10) = 5(5)
T = 75 N Ans
15 5
m2g
m g
m1g
T
T T
T
m1
m2
a a
a
m2
m2g
a = 5 m/s2
T = ?
31. – F ˆ F www.schoolDD.com 30
F 19
F 100 kg F F F F
F F F F F F
F F F F F 5 m/s2
F
F F F F F F F F F
F F F a = 5 m/s2
( )
∑ F = ma
F F F = ma
F mg N = ma
100(10) N = 100(5)
N = 500 N
F F = 50 ˈ F Ans
F F F !!”
F 20
F F 20 F F F F ˈ F F
. F F
. F F F 1 m/s2
. F F F 1 m/s2
. F F 1 m/s
. F F F 1 m/s2
. F F F 1 m/s2
. F F 1 m/s
. F
F
F F F F F F F
N F
F F F 3
”
N
a = 5 m/s2
mg
32. – F ˆ F www.schoolDD.com 31
. F F a = 0
∑ F = ma
N - mg = 0
N = mg
N = 100 (10) = 1000 N
F F = 100 Ans
. F F F a = 1 m/s2
∑ F = ma
N - mg = ma
N = m (a + g)
N = 100 (1 + 10)
N = 1100 N
F F = 110 Ans
. F F F a = -1 m/s2
∑ F = ma
N - mg = ma
N = m (a + g)
N = 100 (-1 + 10)
N = 900 N
F F = 90 Ans
. F F v = 1 m/s a = 0
∑ F = ma
N - mg = 0
N = mg
N = 100 (10)
N = 1000 N
F F = 100 Ans
. F F F a = 1 m/s2
∑ F = ma
mg - N = ma
N = m (g - a)
N = 100 (10 - 1)
F ”
F F F ˈ F
F
F 2 F ”
F F F a ˈ - F
F
F F ”
F F F ˈ
F F”
N
a = 0
mg
N
a = 1 m/s2
mg
N
a = -1 m/s2
mg
N
v
a = 0mg
N
a = 1 m/s2
mg
33. – F ˆ F www.schoolDD.com 32
N = 900 N
F F = 90 Ans
. F F F a = -1 m/s2
∑ F = ma
mg - N = ma
N = m (g - a)
N = 100 (10 - (-1))
N = 1100 N
F F = 110 Ans
. F F v = 1 m/s a = 0
∑ F = ma
mg - N = 0
N = mg
N = 100 (10)
N = 1000 N
F F = 100 Ans
. F a = g
∑ F = ma
mg - N = mg
N = 0 N
F F = 0 Ans
F 21
50 kg F F F F 0.5 m/s2
F F F F 40 kg F
F !! ! F F F
F F
F F a = g”
N
a = -1 m/s2
mg
N
v
a = 0mg
N
a = g
mg
34. – F ˆ F www.schoolDD.com 33
( ) F
∑ F = ma
F F F = ma
F mg N T = ma
50(10) 400 T = 50(0.5)
T = 75 N Ans
F 22
F 40 kg F 30
F F ˈ
( F ) F
F F F F F N F F F
F F F F N
T = ?
mg
N = 400 N
a = 0.5
30°
30°
N
mg
mg sin30
a
N = ?
mgay
30°
ax = a cos30
ay = a sin30a
35. – F ˆ F www.schoolDD.com 34
F mg sin30
mg
∑ F = ma
F F F = ma
F mg sin30 = ma
a = g sin30
= 10(1/2)
a = 5 m/s2
ay = a sin30 = (5x1/2) = 2.5 m/s2
∑ F = ma
F F F = ma
F mg N = may
40(10) N = 40(2.5)
N = 300 N
F F = 30 Ans
F 23
70 kg F F
. F F 1 m/s2
. F F 1 m/s2
. F F a = 1 m/s2
∑ F = ma
F
( ) F
T mg”
mg
a = 1 m/s2
T
36. – F ˆ F www.schoolDD.com 35
F F F = ma
F T mg = ma
T 70(10) = 70(1)
T = 770 N Ans
. F F a = 1 m/s2
∑ F = ma
F F F = ma
F mg T = ma
70(10) T = 70(1)
T = 630 N Ans
F F F F ˈ F ?”
F 24
F F 8 kg F F F 10 kg F
F F F F F F
F F F F F F F
F F F F a1 = 0
F
∑ F = ma
mg
a = 1 m/s2
T
T
m1g
a1 = 0
37. – F ˆ F www.schoolDD.com 36
F T = m1g a = 0
T = 10(10)
T = 100 N
∑ F = ma
F F F = ma
F T m2g = m2a2
100 8(10) = 8 a2
a2 = 2.5
F F F F 2.5 m/s2
Ans
F 25
F 2 F F F ˈ 0.25
F F
F F F
F F ˈ F F F
F F 3 F
”
F F N1 F
F F F F N2
F F F F F
a2 = ?
T
m2g
6 kg
4kg
F = 100 N
f2
f1
N1
N2
T
F = 100 N
m2g
a
f1
a
N1
T
m1g
38. – F ˆ F www.schoolDD.com 37
F m1 = 4
∑ F = ma
F F F = ma
F T f1 = m1a
T ߤN1 = m1a
T 0.25(4x10) = 4a
T = 4a + 10 ---- (1)
F F m2 = 6
∑ F = ma
F F F = ma
F F T f1 f2 = m2a
F T (1) f = µN
F (4a + 10) ߤN1 ߤN2 = m2a
N1 = m1g , N2 = N1 + m2g F
F (4a + 10) ߤm1g ߤ(N1 + m2g) = m2a
100 (4a + 10) 0.25(4x10) 0.25(4x10 + 6x10) = 6a
a = 5.5 m/s2
Ans
F a (1)
T = 4a + 10
T = 4(5.5) + 10
T = 32 N Ans
F F F
∑ F = ma
F F F = ma
F - f2 - f1 - f1 = (m1 + m2)a
100 - 0.25(10x10) - 0.25(4x10) - 0.25(4x10) = 10a
a = 5.5 m/s2
Ans
39. – F ˆ F www.schoolDD.com 38
F 26
F F F F F F F F
F F F 0.50 ( F )
F
∑ F = ma
F F F = ma
F N = ma --- (1)
F
F f = mg
ߤN = mg
N = mg/ߤ
F N (1)
N = ma --- (1)
mg/ߤ = ma
a = g/ ߤ F F
a = 10/ 0.5
a = 20 m/s2
Ans
F F F F F F F F
F
F ˇ F F
F
a
a = ?
N
f
mg
40. – F ˆ F www.schoolDD.com 39
F 27
F F F F F F
F F 10 m/s2
F
∑ F = ma
F F F = ma
F Tsinθ = ma --- (1)
F
F Tcosθ = mg --- (2)
(1)/ (2) , Tsinθ/ Tcosθ = ma/mg
tanθ = a/g
tanθ = 10/10
tanθ = 1
θ = 45° Ans
F
”
a = 10 m/s2
T
Tsinθ
mg
Tcosθ
θ
a = 10 m/s2
θ
F
- F F F F F ! F F
F F F ˈ F F F
F F F F ʿ F F
F F ˆ F F
41. – F ˆ F www.schoolDD.com 40
3.6 F
F F F F
F F F F F F F ˈ
F F
F
F F
F F F
........
m1 m2 ˈ
R ˈ F
G ˈ F F F F 6.673 x 10-11
Nm2
/kg2
FG ˈ F
F F F F
F F F F F
FG =
ୋ୫భ୫మ
ୖమ
mg =
ୋ୫୫
ୖ
మ
me =
ୖ
మ
ୋ
FG =
۵ܕܕ
܀
m
mg
FGRe
me
FG FG
R
m1 m2
F
FG FG
m1
m2
R
42. – F ˆ F www.schoolDD.com 41
F Re = 6.38 x 106
m
me = 9.8(6.38 x 106
)2
/(6.67 x 10-11
)
me = 5.98 x 1024
kg
F F F F F F
FG =
ୋ୫భ୫మ
ୖమ
mg =
ୋ୫୫
ୖమ
g =
ୋ୫
ୖమ
ˈ F F F g R F
F 28
F 1.0 2.0 F F
1.0 F G = 6.6 x 10-11
Nm2
/kg2
m1 = 1.0x10-12
x10-3
= 1.0x10-15
kg
m2 = 2.0x10-9
x10-3
= 2.0x10-12
kg
R = 1.0 x10-6
m
FG =
ୋ୫భ୫మ
ୖమ
F F FG =
.୶ଵషభభ୶ଵ.୶ଵషభఱ୶ଶ.୶ଵషభమ
ሺଵ.୶ଵషలሻమ
FG = 1.32 x 10-25
N Ans
FG FG
R
m1 m2
m
mg
FG
R
me
43. – F ˆ F www.schoolDD.com 42
F 29
F F 900 F F F F 3 F
F F F
F
FG =
ୋ୫భ୫మ
ୖమ
G , m1 , m2 F
F F FG ן
ଵ
ୖమ
ృమ
ృభ
=
ୖభ
మ
ୖమ
మ
F F
ృమ
ଽ
=
ୖభ
మ
ሺଷୖభሻమ
FG2 = 100 N Ans
m
mg1
FG1R1
me
FG1 = mg1 = 900 N FG2 = mg2 = ?
m
mg2
FG2
R2 = 3R1
me