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.
SchoolDD.com provides concise explanations of trigonometric concepts like sine, cosine, and tangent functions. It explains how to use trigonometric functions to solve problems involving right triangles, with examples calculating values for angles like 30°, 60°, 37°, and 53° degrees. The site also summarizes trigonometric identity formulas and relationships between sine, cosine, and tangent for various angles.
The document summarizes concepts related to forces and motion. It defines key terms like work, kinetic energy, and potential energy. It provides formulas for calculating work, kinetic energy, and gravitational potential energy. Examples are given to demonstrate applying the concepts and formulas to solve physics problems involving changes in kinetic and potential energy.
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 radioisotopes 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 equivalents are also briefly discussed.
This document provides a concise summary of key scientific concepts and formulas in fewer than 3 sentences. It begins by defining common scientific units used to measure length, mass, time, electric current, temperature, amount of substance, and luminous intensity. It then explains the International System of Prefixes used to modify unit symbols and provides examples of their use. The document proceeds to demonstrate the application of scientific concepts and formulas to solve problems involving length, area, volume, speed, time period, percentage error, and other topics. Diagrams are included to illustrate geometric and trigonometric relationships. Key formulas from algebra, trigonometry, logarithms, and other areas are also summarized concisely.
The document summarizes key concepts about electricity and electrical circuits. It discusses:
1) Direct current (DC) and alternating current (AC), explaining the difference between constant and varying current over time.
2) Transformers, describing how they work by electromagnetic induction to change voltage and current levels while transmitting power.
3) Circuit parameters like voltage, current, resistance and power in AC circuits. Formulas are given relating peak, RMS and average values.
4) Waveforms of voltage, current and power over time in an AC circuit, showing their sinusoidal variation and phase relationship.
In 3 sentences or less, the document provides an overview of basic electrical concepts like different current types, transformer
1. Electric fields are produced by electric charges and can be calculated using Coulomb's law. Positive charges produce outward electric fields while negative charges produce inward electric fields.
2. The electric field strength is directly proportional to the magnitude of the charge producing the field and inversely proportional to the distance from that charge.
3. Electric potential difference is equal to the work done moving a test charge between two points in an electric field, and is calculated by multiplying the charge by the potential.
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 such as amplitude modulation (AM) and frequency modulation (FM). AM varies the amplitude of the carrier wave while FM varies the frequency.
3. It provides an overview of the electromagnetic spectrum, showing the range of wavelengths and frequencies used for communications technologies like radio and television broadcasting.
1. The document discusses weeding and withdrawing materials from a library collection. It describes several factors to consider when deciding what to remove, such as outdated content, unused items, and materials in poor physical condition.
2. Guidelines are provided for how to evaluate items for withdrawal, such as checking circulation records and considering the accuracy and authority of the content. A multi-step weeding process is outlined that involves reviewing sections of the collection.
3. Reasons for regularly weeding a library collection include making room for new materials, shifting collections to better suit user needs, and removing outdated information.
SchoolDD.com provides concise explanations of trigonometric concepts like sine, cosine, and tangent functions. It explains how to use trigonometric functions to solve problems involving right triangles, with examples calculating values for angles like 30°, 60°, 37°, and 53° degrees. The site also summarizes trigonometric identity formulas and relationships between sine, cosine, and tangent for various angles.
The document summarizes concepts related to forces and motion. It defines key terms like work, kinetic energy, and potential energy. It provides formulas for calculating work, kinetic energy, and gravitational potential energy. Examples are given to demonstrate applying the concepts and formulas to solve physics problems involving changes in kinetic and potential energy.
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 radioisotopes 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 equivalents are also briefly discussed.
This document provides a concise summary of key scientific concepts and formulas in fewer than 3 sentences. It begins by defining common scientific units used to measure length, mass, time, electric current, temperature, amount of substance, and luminous intensity. It then explains the International System of Prefixes used to modify unit symbols and provides examples of their use. The document proceeds to demonstrate the application of scientific concepts and formulas to solve problems involving length, area, volume, speed, time period, percentage error, and other topics. Diagrams are included to illustrate geometric and trigonometric relationships. Key formulas from algebra, trigonometry, logarithms, and other areas are also summarized concisely.
The document summarizes key concepts about electricity and electrical circuits. It discusses:
1) Direct current (DC) and alternating current (AC), explaining the difference between constant and varying current over time.
2) Transformers, describing how they work by electromagnetic induction to change voltage and current levels while transmitting power.
3) Circuit parameters like voltage, current, resistance and power in AC circuits. Formulas are given relating peak, RMS and average values.
4) Waveforms of voltage, current and power over time in an AC circuit, showing their sinusoidal variation and phase relationship.
In 3 sentences or less, the document provides an overview of basic electrical concepts like different current types, transformer
1. Electric fields are produced by electric charges and can be calculated using Coulomb's law. Positive charges produce outward electric fields while negative charges produce inward electric fields.
2. The electric field strength is directly proportional to the magnitude of the charge producing the field and inversely proportional to the distance from that charge.
3. Electric potential difference is equal to the work done moving a test charge between two points in an electric field, and is calculated by multiplying the charge by the potential.
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 such as amplitude modulation (AM) and frequency modulation (FM). AM varies the amplitude of the carrier wave while FM varies the frequency.
3. It provides an overview of the electromagnetic spectrum, showing the range of wavelengths and frequencies used for communications technologies like radio and television broadcasting.
1. The document discusses weeding and withdrawing materials from a library collection. It describes several factors to consider when deciding what to remove, such as outdated content, unused items, and materials in poor physical condition.
2. Guidelines are provided for how to evaluate items for withdrawal, such as checking circulation records and considering the accuracy and authority of the content. A multi-step weeding process is outlined that involves reviewing sections of the collection.
3. Reasons for regularly weeding a library collection include making room for new materials, shifting collections to better suit user needs, and removing outdated information.
This 3 sentence summary provides the key details from the document:
The document outlines a plan to provide IT retraining for unemployed persons between June 1st-17th 2022, with goals of teaching basic IT skills and knowledge through hands-on learning activities. The plan includes training 60 people in groups of 20 over 5 days, from 9am-5pm daily, on topics such as operating systems, software applications and the basics of cybersecurity. The training will take place at the Most Science and Technology Discovery Centre and aims to help trainees enhance their job opportunities.
This document discusses rubber and the rubber production process. It mentions key ingredients used to make rubber such as carbon black, zinc oxide, sulfur, and additives. It also discusses the vulcanization process where sulfur is added to create cross-linking between polymer chains, and how this process strengthens the rubber and improves its elasticity and durability. The document provides contact information for an organization that may be able to provide more details on rubber production and properties.
The document summarizes the impacts of climate variability on Thailand in 3 sentences: Climate variability affects Thailand's agriculture and economy. Changes in temperature and rainfall patterns impact crop yields and damage from droughts and floods has increased economic losses. Understanding climate patterns like the Arctic oscillation and Jet Stream can help Thailand prepare for and adapt to climate impacts.
1. The document discusses the principles of refraction of light through spherical lenses and thin lenses. It defines terms such as focal length, focal point, radius of curvature, and refractive index.
2. Formulas are provided relating refractive index, angles of incidence and refraction, and focal lengths for different lens materials.
3. Worked examples apply the formulas to calculate focal lengths, refractive indices, angles of refraction and incidence, and image distances for various lens configurations and materials.
1) A document from 2552 discusses healthcare spending trends from 2547-2552, noting a rise in costs per hospital admission from $2532 in 2547 to over $9000 by 2552 due to factors like longer hospital stays and new medical technologies.
2) The average length of hospital stays decreased from 14 days in 2547 to just over 7 days in 2552, but costs per stay increased dramatically.
3) Spending is increasingly dominated by a small group of high-cost patients that account for a large share of total costs.
This document contains summaries of several articles from Volume 4 Issue 60 of a publication dated April 6-12, 2011:
1) An article discusses family poultry farming and issues facing small holders from April 25-27, 2011. It mentions support from the FAO and development of a prototype.
2) A training event was held on April 30, 2011 from 09:00-16:30 covering topic "SSpec 105." There were 5 participants.
3) Upcoming training events organized by NBT are announced from July 7-28, 2011 on various topics with 4-7 participants expected each time.
F 1) A circumzenithal arc (CZA) appeared over Grand Forks, caused by the refraction of sunlight through ice crystals in high cirrostratus clouds. 2) A CZA is a halo that forms a horizontal arc around the point in the sky directly overhead (the zenith). 3) The document provides details on the formation of CZAs and includes links to websites with further information and examples of this atmospheric optical phenomenon.
1) The document discusses how ideas spread and evolve over time through three life cycles or "P cycles".
2) It analyzes how ideas progress from novelty to acceptance using the concepts of "Pioneer, Practitioner, and Parent" as defined by Davenport and Prusak.
3) Key factors that influence the life cycles of ideas include communication, activities, experiences, culture and learning within an organization.
Nittaya Tongdeeying is a 40-year-old woman providing her contact information including her name, surname, age, and email address. She has worked at Sahavicha Media Company for over 10 years, where her roles have included editor, reporter, and manager of the company's website. She is seeking new career opportunities where she can continue working as a writer and editor and apply her skills and experience.
The document discusses exposure assessment and methods to measure exposure to environmental contaminants. It describes the Total Exposure Assessment Methodology (TEAM) study conducted by the EPA to evaluate exposures. The TEAM study examined 34 volunteer families over several weeks to measure exposures to air and water pollutants both inside and outside the home.
The document discusses various linguistic concepts including sounds, words, sentences, and meanings. It notes that languages are complex systems of organization and communication made up of different elements at different levels.
The solar system formed from a cloud of gas and dust approximately 4.6 billion years ago. As the cloud collapsed due to gravity, it began to spin and form a disk. Most of the material ended up in the center to form the sun, while the rest flattened into a protoplanetary disk that later condensed into planets, moons, and other objects like asteroids and comets. Over time, gravitational interactions between the objects led them to take on orbits within separate regions like the inner and outer planets, asteroid and Kuiper belts, and scattered disk.
Microsoft word แบบฝึกอ่านนิทานเรื่องธาตุก่องข้าวน้อยนิตยา ทองดียิ่ง
1. The document describes the SQ3R method for effective reading comprehension.
2. The SQ3R method involves 5 steps: Survey, Question, Read, Recite, and Review.
3. Examples are provided for how to apply each step of the SQ3R method when reading a text passage.
1. The document discusses projectile motion and provides equations to calculate the time, height, horizontal displacement, and velocity of a projectile over time given the initial velocity and angle of launch.
2. Formulas are derived for calculating time, maximum height, and horizontal displacement of a projectile based on the initial velocity components along x and y axes.
3. Examples are provided to demonstrate how to apply the equations to different launch angles like 45 degrees, 60 degrees, and 30 degrees.
This 3 sentence summary provides the key details from the document:
The document outlines a plan to provide IT retraining for unemployed persons between June 1st-17th 2022, with goals of teaching basic IT skills and knowledge through hands-on learning activities. The plan includes training 60 people in groups of 20 over 5 days, from 9am-5pm daily, on topics such as operating systems, software applications and the basics of cybersecurity. The training will take place at the Most Science and Technology Discovery Centre and aims to help trainees enhance their job opportunities.
This document discusses rubber and the rubber production process. It mentions key ingredients used to make rubber such as carbon black, zinc oxide, sulfur, and additives. It also discusses the vulcanization process where sulfur is added to create cross-linking between polymer chains, and how this process strengthens the rubber and improves its elasticity and durability. The document provides contact information for an organization that may be able to provide more details on rubber production and properties.
The document summarizes the impacts of climate variability on Thailand in 3 sentences: Climate variability affects Thailand's agriculture and economy. Changes in temperature and rainfall patterns impact crop yields and damage from droughts and floods has increased economic losses. Understanding climate patterns like the Arctic oscillation and Jet Stream can help Thailand prepare for and adapt to climate impacts.
1. The document discusses the principles of refraction of light through spherical lenses and thin lenses. It defines terms such as focal length, focal point, radius of curvature, and refractive index.
2. Formulas are provided relating refractive index, angles of incidence and refraction, and focal lengths for different lens materials.
3. Worked examples apply the formulas to calculate focal lengths, refractive indices, angles of refraction and incidence, and image distances for various lens configurations and materials.
1) A document from 2552 discusses healthcare spending trends from 2547-2552, noting a rise in costs per hospital admission from $2532 in 2547 to over $9000 by 2552 due to factors like longer hospital stays and new medical technologies.
2) The average length of hospital stays decreased from 14 days in 2547 to just over 7 days in 2552, but costs per stay increased dramatically.
3) Spending is increasingly dominated by a small group of high-cost patients that account for a large share of total costs.
This document contains summaries of several articles from Volume 4 Issue 60 of a publication dated April 6-12, 2011:
1) An article discusses family poultry farming and issues facing small holders from April 25-27, 2011. It mentions support from the FAO and development of a prototype.
2) A training event was held on April 30, 2011 from 09:00-16:30 covering topic "SSpec 105." There were 5 participants.
3) Upcoming training events organized by NBT are announced from July 7-28, 2011 on various topics with 4-7 participants expected each time.
F 1) A circumzenithal arc (CZA) appeared over Grand Forks, caused by the refraction of sunlight through ice crystals in high cirrostratus clouds. 2) A CZA is a halo that forms a horizontal arc around the point in the sky directly overhead (the zenith). 3) The document provides details on the formation of CZAs and includes links to websites with further information and examples of this atmospheric optical phenomenon.
1) The document discusses how ideas spread and evolve over time through three life cycles or "P cycles".
2) It analyzes how ideas progress from novelty to acceptance using the concepts of "Pioneer, Practitioner, and Parent" as defined by Davenport and Prusak.
3) Key factors that influence the life cycles of ideas include communication, activities, experiences, culture and learning within an organization.
Nittaya Tongdeeying is a 40-year-old woman providing her contact information including her name, surname, age, and email address. She has worked at Sahavicha Media Company for over 10 years, where her roles have included editor, reporter, and manager of the company's website. She is seeking new career opportunities where she can continue working as a writer and editor and apply her skills and experience.
The document discusses exposure assessment and methods to measure exposure to environmental contaminants. It describes the Total Exposure Assessment Methodology (TEAM) study conducted by the EPA to evaluate exposures. The TEAM study examined 34 volunteer families over several weeks to measure exposures to air and water pollutants both inside and outside the home.
The document discusses various linguistic concepts including sounds, words, sentences, and meanings. It notes that languages are complex systems of organization and communication made up of different elements at different levels.
The solar system formed from a cloud of gas and dust approximately 4.6 billion years ago. As the cloud collapsed due to gravity, it began to spin and form a disk. Most of the material ended up in the center to form the sun, while the rest flattened into a protoplanetary disk that later condensed into planets, moons, and other objects like asteroids and comets. Over time, gravitational interactions between the objects led them to take on orbits within separate regions like the inner and outer planets, asteroid and Kuiper belts, and scattered disk.
Microsoft word แบบฝึกอ่านนิทานเรื่องธาตุก่องข้าวน้อยนิตยา ทองดียิ่ง
1. The document describes the SQ3R method for effective reading comprehension.
2. The SQ3R method involves 5 steps: Survey, Question, Read, Recite, and Review.
3. Examples are provided for how to apply each step of the SQ3R method when reading a text passage.
1. The document discusses projectile motion and provides equations to calculate the time, height, horizontal displacement, and velocity of a projectile over time given the initial velocity and angle of launch.
2. Formulas are derived for calculating time, maximum height, and horizontal displacement of a projectile based on the initial velocity components along x and y axes.
3. Examples are provided to demonstrate how to apply the equations to different launch angles like 45 degrees, 60 degrees, and 30 degrees.
This document provides information about the International System of Units (SI) including:
1. It lists the 7 base units used in the SI system: meter (m), kilogram (kg), second (s), ampere (A), kelvin (K), mole (mol), and candela (cd).
2. It explains the prefixes that are used with units to indicate decimal multiples or submultiples, such as kilo (k) for 1000 and milli (m) for 0.001.
3. It provides examples of converting between units using prefixes, such as converting 4,700,000,000 meters to megameters (Mm) or 0.0004 meters to mill
1. Democritus proposed that all matter is composed of tiny indivisible particles called atoms.
2. He described atoms as solid, indestructible, and existing in empty space. Atoms come in an infinite number of shapes and sizes and cluster together to form the objects we see.
3. The atomic model was later expanded upon by scientists like J.J. Thomson who discovered the electron and proposed that atoms have a small, dense positively charged center surrounded by even smaller, negatively charged electrons.
This document provides information about a 3-day workshop on planetary astronomy that will be held from August 13-15. The workshop will be hosted by the LESA Center and held at the National Science and Technology Development Agency. It will provide training on identifying planets, exoplanets, and small bodies in the solar system. The workshop is limited to 20 participants and the registration deadline is July 17. More information can be found on the LESA Center website or by contacting provided email address.
This document discusses the importance of forests and trees for absorbing carbon dioxide from the atmosphere. It notes that forests currently absorb about one-third of the carbon emissions produced by humans each year. Maintaining and expanding forests is crucial for mitigating the effects of climate change by continuing to remove carbon from the air we breathe.
1. The document discusses a project to install lightning protection systems at 2551 locations across Thailand.
2. It details the budget of 1,383,053 baht for the project and notes that installation has been completed at 157,728 locations so far.
3. The project aims to have lightning protection installed at all 2551 locations by the end of 2022.
1. The document discusses a mathematical formula for calculating the total resistance of parallel resistors. It provides the individual resistance formulas for two, three, and four parallel resistors.
2. Examples are given applying the formulas to calculate total resistance given the individual resistances. In one example, the individual resistances are 2 ohms, 3 ohms and 6 ohms, and the calculated total resistance is 1.5 ohms.
3. The key points are that the total resistance of parallel resistors decreases as more resistors are added, and the formula involves taking the reciprocal of the sum of the reciprocals of the individual resistances.
1. The document discusses weeding and withdrawing materials from a library collection. It focuses on criteria for removing e-books, e-journals, and other e-resources from the collection.
2. Key criteria for weeding e-resources include usage statistics, the condition and age of the materials, and whether the materials are within the scope of the collection.
3. The document provides guidance on applying weeding criteria to different types of e-resources and maintaining ongoing weeding practices to keep the collection current and relevant.
1. The document is a tutorial on scientific notation from the website www.schoolDD.com.
2. It explains scientific notation and provides examples for converting numbers between standard form and scientific notation.
3. Key concepts covered include the meaning of prefixes like milli, mega, and kilo, as well as how to perform calculations using numbers in scientific notation.
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 provides information about physics concepts including force, mass, weight, vectors, trigonometry functions, and angle identities. It defines force, mass, and weight, and gives the equations for calculating weight using mass and gravitational acceleration. It also explains vector addition and subtraction, and how to use trigonometry functions like sine, cosine, and tangent to solve problems involving angles. Several example problems are provided to demonstrate applying these concepts.
Microsoft word ใบความรู้ระบบลำเลียงสารของสัตว์Thanyamon Chat.
1. The document describes the open and closed circulatory systems of arthropods.
2. In an open circulatory system, blood is pumped into the hemocoel by the heart and circulates through branching vessels called sinuses before diffusing into tissues.
3. In a closed circulatory system, blood is contained and circulated through arteries, capillaries, and veins by the heart in a loop.
The document summarizes key concepts about electricity and electrical circuits. It discusses:
1. Direct current (DC) and alternating current (AC), defining their characteristics.
2. Transformers, explaining how they work to change voltage and current levels in circuits using electromagnetic induction.
3. Electrical power calculations, defining formulas for power, voltage, current and resistance.
4. Characteristics of alternating current, including definitions of peak, root mean square and average values of voltage, current and power.
The document provides concise explanations of important electrical concepts with relevant formulas and examples.
The document summarizes key concepts about electricity and electrical circuits. It discusses:
1. Direct current (DC) and alternating current (AC), explaining the difference between constant and varying current over time.
2. Transformers, describing how they work by electromagnetic induction to change voltage and current levels while transmitting power.
3. Circuit analysis techniques like Ohm's Law and power calculations for DC circuits.
4. Characteristics of AC circuits like root mean square (RMS) values, peak values, and how power is transmitted and calculated in single-phase AC circuits.
MOST is an acronym that outlines principles for modernizing government. M stands for merit and modernization in recruitment and processes. O refers to being outcome oriented. S is for social accountability. T means transparency. The last letter, E, represents teamwork within and across departments. The document provides five points about implementing the MOST principles: prioritizing merit, linking performance to outcomes, increasing transparency, cross-departmental coordination, and fostering innovation.
[1] The document discusses feedback from two participants (F1 and F2) on a training program involving different techniques.
[2] F1 felt some techniques were difficult but provided positive feedback on other aspects. F2 provided some criticism but also acknowledged areas that worked well.
[3] Both participants suggested some ways to improve the program based on their experiences. Overall the feedback seemed aimed at helping to enhance the training for future participants.
The document discusses knowledge management and sharing through dialogue. It states that dialogue allows for the exchange of knowledge between individuals and groups. This can help organizations better understand problems and find solutions. The key aspects that enable effective knowledge sharing through dialogue are building trust between participants, discussing topics in an open and informal manner, and creating an environment for collaborative learning.
1. Photosynthesis is the process by which plants, algae, and some bacteria use sunlight, carbon dioxide, and water to produce oxygen and energy in the form of glucose.
2. The general equation for photosynthesis is: carbon dioxide + water + energy (sunlight) → glucose + oxygen.
3. Environmental factors like temperature, light intensity, and carbon dioxide levels can affect the rate of photosynthesis, with optimal conditions usually between 14-18°C, 30-40% relative humidity, and 12-16 hours of sunlight per day.
The document discusses the Thailand Center of Excellence for Life Sciences (TCELS). It notes that TCELS aims to support research and development in life sciences. TCELS provides facilities and resources to researchers working in areas like biotechnology, medical technology, and agriculture. The document lists TCELS's contact information.
The document discusses a conversation between two individuals. They discuss various topics including a festival, different foods and drinks, and activities. They consider attending the festival but note it may be crowded.
1. The document discusses concepts related to sound waves including frequency, wavelength, and speed of sound waves. It provides examples of calculating the speed of sound waves at different temperatures.
2. Formulas are given for calculating speed of sound waves based on temperature. The speed increases by 6 m/s as temperature rises from 25°C to 35°C, as shown through an example calculation.
3. Additional concepts covered include using the frequency and wavelength of a sound wave to calculate its speed, and examples of applying the concepts and formulas to solve problems.
1. The document discusses simple harmonic motion (SHM) and describes the sinusoidal function y=Asin(ωt) that models SHM.
2. Various examples of SHM are shown, including spring oscillations and waves on a string. The key parameters like amplitude, angular frequency, and period are defined.
3. Standing waves on a string are analyzed, with nodes and antinodes labeled according to the quantization condition that the string length must be an integer multiple of half wavelengths. Formulas for calculating wavelength and frequency are provided.
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 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.
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.
1. O documento apresenta exemplos de cálculos de momento linear e impulso para sistemas de uma e duas partículas.
2. São resolvidos problemas envolvendo colisões elásticas e inelásticas entre partículas, calculando velocidades iniciais e finais a partir da conservação do momento linear.
3. Introduz conceitos como força, massa, velocidade, tempo de interação e coeficientes de atrito para analisar situações dinâmicas de um corpo sob ação de forças.
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
বাংলাদেশের অর্থনৈতিক সমীক্ষা ২০২৪ [Bangladesh Economic Review 2024 Bangla.pdf] কম্পিউটার , ট্যাব ও স্মার্ট ফোন ভার্সন সহ সম্পূর্ণ বাংলা ই-বুক বা pdf বই " সুচিপত্র ...বুকমার্ক মেনু 🔖 ও হাইপার লিংক মেনু 📝👆 যুক্ত ..
আমাদের সবার জন্য খুব খুব গুরুত্বপূর্ণ একটি বই ..বিসিএস, ব্যাংক, ইউনিভার্সিটি ভর্তি ও যে কোন প্রতিযোগিতা মূলক পরীক্ষার জন্য এর খুব ইম্পরট্যান্ট একটি বিষয় ...তাছাড়া বাংলাদেশের সাম্প্রতিক যে কোন ডাটা বা তথ্য এই বইতে পাবেন ...
তাই একজন নাগরিক হিসাবে এই তথ্য গুলো আপনার জানা প্রয়োজন ...।
বিসিএস ও ব্যাংক এর লিখিত পরীক্ষা ...+এছাড়া মাধ্যমিক ও উচ্চমাধ্যমিকের স্টুডেন্টদের জন্য অনেক কাজে আসবে ...
Main Java[All of the Base Concepts}.docxadhitya5119
This is part 1 of my Java Learning Journey. This Contains Custom methods, classes, constructors, packages, multithreading , try- catch block, finally block and more.
ISO/IEC 27001, ISO/IEC 42001, and GDPR: Best Practices for Implementation and...PECB
Denis is a dynamic and results-driven Chief Information Officer (CIO) with a distinguished career spanning information systems analysis and technical project management. With a proven track record of spearheading the design and delivery of cutting-edge Information Management solutions, he has consistently elevated business operations, streamlined reporting functions, and maximized process efficiency.
Certified as an ISO/IEC 27001: Information Security Management Systems (ISMS) Lead Implementer, Data Protection Officer, and Cyber Risks Analyst, Denis brings a heightened focus on data security, privacy, and cyber resilience to every endeavor.
His expertise extends across a diverse spectrum of reporting, database, and web development applications, underpinned by an exceptional grasp of data storage and virtualization technologies. His proficiency in application testing, database administration, and data cleansing ensures seamless execution of complex projects.
What sets Denis apart is his comprehensive understanding of Business and Systems Analysis technologies, honed through involvement in all phases of the Software Development Lifecycle (SDLC). From meticulous requirements gathering to precise analysis, innovative design, rigorous development, thorough testing, and successful implementation, he has consistently delivered exceptional results.
Throughout his career, he has taken on multifaceted roles, from leading technical project management teams to owning solutions that drive operational excellence. His conscientious and proactive approach is unwavering, whether he is working independently or collaboratively within a team. His ability to connect with colleagues on a personal level underscores his commitment to fostering a harmonious and productive workplace environment.
Date: May 29, 2024
Tags: Information Security, ISO/IEC 27001, ISO/IEC 42001, Artificial Intelligence, GDPR
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Macroeconomics- Movie Location
This will be used as part of your Personal Professional Portfolio once graded.
Objective:
Prepare a presentation or a paper using research, basic comparative analysis, data organization and application of economic information. You will make an informed assessment of an economic climate outside of the United States to accomplish an entertainment industry objective.
A Strategic Approach: GenAI in EducationPeter Windle
Artificial Intelligence (AI) technologies such as Generative AI, Image Generators and Large Language Models have had a dramatic impact on teaching, learning and assessment over the past 18 months. The most immediate threat AI posed was to Academic Integrity with Higher Education Institutes (HEIs) focusing their efforts on combating the use of GenAI in assessment. Guidelines were developed for staff and students, policies put in place too. Innovative educators have forged paths in the use of Generative AI for teaching, learning and assessments leading to pockets of transformation springing up across HEIs, often with little or no top-down guidance, support or direction.
This Gasta posits a strategic approach to integrating AI into HEIs to prepare staff, students and the curriculum for an evolving world and workplace. We will highlight the advantages of working with these technologies beyond the realm of teaching, learning and assessment by considering prompt engineering skills, industry impact, curriculum changes, and the need for staff upskilling. In contrast, not engaging strategically with Generative AI poses risks, including falling behind peers, missed opportunities and failing to ensure our graduates remain employable. The rapid evolution of AI technologies necessitates a proactive and strategic approach if we are to remain relevant.
Thinking of getting a dog? Be aware that breeds like Pit Bulls, Rottweilers, and German Shepherds can be loyal and dangerous. Proper training and socialization are crucial to preventing aggressive behaviors. Ensure safety by understanding their needs and always supervising interactions. Stay safe, and enjoy your furry friends!
it describes the bony anatomy including the femoral head , acetabulum, labrum . also discusses the capsule , ligaments . muscle that act on the hip joint and the range of motion are outlined. factors affecting hip joint stability and weight transmission through the joint are summarized.
2. 16
16.1
(electric current)
. .
F
. F F
F F F F
F F F F
.
F F F
F F F F F
F F F F F F F F F F F
F F F F F F F
F F F F F F F
16.1.1
F
(free electron) FF
F F F F F F (Brownian motion)
F F
F F www.schoolDD.com 1
3. F F F F F
F F F
(drift velocity) F F
VA VB VA VB
VA = VB VB > VA
F F
F F F F F F
F F F (VA = VB) (VB > VA) F
16.1.2
F F
F F F
F F F F F F (A)
I=
I= (A)
Q= ( ) F (C)
t= F (s)
I E
F 1
F 1.25 F F F F F F
F 5 F F
F F www.schoolDD.com 2
4. I = 1.25 A t=5,Q=?
I=
Q = It
= 1.25x5.0
Q = 6.25 C Ans
F 2
F F F F F F 3.2 F
F F 5.0 ( 1.6 X10-19 )
F
I = 3.2 A
I=
Q = It
I I
Q = 3.2x5.0 C
F 1 1.6 X10-19 C
=
= 1x1020 Ans
F F
I , F E
E
(I)
F
s = vt
F F www.schoolDD.com 3
5. I= Q = Ne = (nAs)e = (nAvt)e = nevtA
I = .
I = nevA
n= F ( / m3)
e= (1.6 x 10- 19 C)
v= (m/s)
A= (m2)
F 3
F 5.0 x 1028 F F F 2.5 F
F F 0.30 F F
F
A = 2.5x10-6 m2
I=? I = nevA
= 5x1028x1.6x10-19x0.3x10-3x2.5x10-6
n = 5x1028 I = 6.0 A Ans
v = 0.3x10-3 m/s
16.2 F F (I) F F (V)
16.2.1 F F
F F F F F
I V
I = KV ( K= F )
=
=R ( = R)
V=IR F
R= F F F F F F ( )
F F www.schoolDD.com 4
6. - F F F F
I I I I
V V V V
F
F 4
F F F F F F
V (V)
3
2
1
I (A)
0 0.2 0.4 0.6
F 5
F F F 1.0 F F F F 1.0 F F
F F
R = 1x106
F V = IR
I = 1x10-3 A I
= 1x10-3x1x106
V = 1x103 V Ans
V=?
F (Resistor)
F F F F F F F F
F 2
1. F (Fixed resistor) F F F
F F F F F F
F F www.schoolDD.com 5
7. 1 2 3 4
4 F
F
1
0 0 1 -
2
1 1 101 1%
3
2 2 102 2%
F 3 3 103 -
4 F
4 4 104 -
F F
5 5 105 - 3
F 15x10 F
6 6 106 -
2% F 15,000 F
F 7 7 - -
300 F F F 14,700 F
8 8 - -
15,300 F
9 9 - -
- - 10-1 5%
- - 10-2 10 %
2. F F (Variable resistor) F F F F F
F F F F F
F F 1 3 F F 2 F F
F F
1 3 F F F 2
A
2 F 1 F 3 F
F F
(Diode)
F F F F F
F 2
I A F F A F
F F F
F F www.schoolDD.com 6
8. - F F F F
F 6
F a F F b F F C
F F F F
F
F a F = 30x102 150
3 0 102 5%
F
F b F = 18x103 1800
3
1 8 10 10%
F c F =
16.2.2 F
F F F
F F F F F F
F F
F F F F (V) (I) F
(R) F F
. F
R
R= F F
F F = 1.6x10-8 m , = 1.7x10-8 m
F = 1010- 1014 m , = 1014- 1018 m
F 7
F 10 F F F F 1 F
F F F 2 F F F F F
F ( = 1.7x10-8 m)
F F www.schoolDD.com 7
9. d = 1x10-3 m
F = 10 m
F A= = = 7.85x10-7 m2
R=
R1 =
R1 = 0.216 Ans
d = 2x10-3 m
F = 10 m
A= = = 3.14x10-6 m2
F
R=
R2 =
R2 = 0.054 Ans
= =4
1 F F 2 F 4 F Ans
G F F F ( F )-1 F (S)
G=
F F F
( F )-1 F F (S/m)
=
16.2.3 F F
F F F
T ---> R
F F F F F
T ---> R
F F
T ---> R
F F www.schoolDD.com 8
10. (Superconductivity) F F ( = 0) F
F (critical temperature) F (Supper
conductor)
16.3
16.3.1 ( E) F F (V)
F F ( F F ) F F F F
F F F
F F
F R
I
I I
E I
F
F F F R F
E F r F F I F F
R
VR
I
V
r E
Vr
F ( ) F F F Q
E F F F r R F F Q F F
F F
F WE = F
WR = F F R
Wr = F F r
F FF WE = W R + W r
QE = QVR + QVr
F E = VR + Vr
F F www.schoolDD.com 9
11. E = IR + Ir
F I=
F V F F F F V = VR
F V F F R F F FV E F F V=E
F 8
F 12.0 F F 2.0 F F F 7.0
F F F F F F F F F F F
F F F F F F
R = 20
VR
I
V=?
r = 2 E = 12 V
Vr
I E = VR + Vr
E = IR + Ir
I= = = A
V = VR = IR
= x70
V = 11.67 V Ans
F F F F
V=?
F V E = 12 V Ans
r = 2 E = 12 V
F F www.schoolDD.com 10
12. 16.3.2
R
I V I
E
FQ= F F t (C)
I= F F (A)
V= F F F (V)
W= F F ( J)
W = QV
I= Q = It V = IR
W = ItV = I2Rt =
P F F F F F (W)
P= P= = = IV
F 9
F 1.5 F2 F F F 20 F
F 20 F F 15 F F 1 F
t = 20 hr
I=20 mA
E = 1.5x2 = 3 V
F W = QV
= ItV
F F www.schoolDD.com 11
13. = 20x10-3x(20x60x60)x3
W = 4320 J
F F 1 F = = 0.007 / Ans
16.4 F F
16.4.1 F F
1. F
F F F F F
V1 V2 V3
R1 R2 R3
I1 I2 I3
V
I
E
F FF
- F F F
I = I1 = I2 = I3
- F F = F F F
V = V1 + V2 + V3
V = V1 + V2 + V3
V = IR ( F )
IR = I1 R1 + I2 R2 + I3R3
R = R1 + R2 + R3 (I = I1 = I2 = I3)
R = F R1,R2 R3
2. F
F F F F
F F www.schoolDD.com 12
14. V1 = V2 = V3
R1
I1 R2
I2
I3 R3
I I
V
E
F FF
- F F F F F = F F
V = V1 = V2 = V3
- F = F F F
I = I1 + I2 + I3
I = I1 + I2 + I3
V = IR I=
= + +
= + + (V = V1 = V2 = V3)
R = F R1 , R 2 R3
- F F F F F F F
F F F F F F F
- F F F F F
F 10
F F F
. FS . FS
F F www.schoolDD.com 13
15. 1 2
A B
S
I
3 4
. FS 1 2
F F R1 R2
A B
R3 R4
I
3 4
F R1 R2 F
F F R 12 = R 1 + R 2 = 1 +2 = 3
F R3 R4 F
F F R 34 = R 3 + R 4 = 3 +4 = 7
F F
3
R12
A B
R34
I
7
F R 12 R 34 F
F F = + = + =
=
R = 2.1 Ans
. FS
F F
1 2
R1 R2
A B
R3 R4
I
3 4
F R1 R3 F
F F www.schoolDD.com 14
16. F F = + = + =
=
R13 =
F R2 R4 F
F F = + = + =
=
R24 =
F F
A 3/4 4/3 B
R13 R24
I
F R 13 R 24 F
F F R = R13 + R24
= + =
=
R = 2.08 Ans
16.4.2 F
1. F
F F F F F
R
I
r1 E1 r2 E2 r3 E3
F FF
- = F
E = E1 + E2 + E3
F F F F
F F www.schoolDD.com 15
17. r = r1 + r2 + r3
2. F
F F F F
R
I r1 E1
r2 E2
r3 E3
F F F F E1 = E2 = E3
F FF
- = F F F
E = E1 = E2 = E3
- F F F F
= + +
- F F F F
F
F 11
F F 0.25 F F F 8 F
F F 0.16 F F
F F F F F E r
F F www.schoolDD.com 16
18. F
R=8
I = 0.25 A V
r1 E1 r2 E2
E = E1 + E2 = E + E = 2E
F r = r1 + r2 = r + r = 2r
F F
R=8
I = 0.25 A
V
r E
V = E Ir
V = IR
F IR = 2E I(2r)
0.25x8 = 2E 0.25(2r)
E 0.25r = 1 ---1
F
R=8
V
I = 0.16 A r1 E1
r2 E2
E = E1 = E2 = E
F = + = + =
r =
F F
R=8
I = 0.16 A
V
r E
F F www.schoolDD.com 17
19. V = E Ir
V = IR
F IR = E I( )
0.16x8 = E 0.16( )
E 0.08r = 1.28 ---2
2-1, -0.08r + 0.25r = 0.28
0.17r = 0.28
r = 1.7 Ans
F r 2 F E 0.08(1.7) = 1.28
E = 1.41 V Ans
16.5 F F
F F F F F
F F
F 12
F F a,b c
F E1 = 6 V , E2 = 6 V , r1 = 1 , r2 = 1 , Ra = 7 , Rb = 4 , Rc = 12
b
a
c
I
r1 E1 r2 E2
F
F b c F F F F a
F b c = + = +
= = =
Rbc = 3
F a bc R = Ra + Rbc
= 7+3
R = 10
E1 E2 F
E = E1 + E2 = 6 + 6 = 12 V
F F www.schoolDD.com 18
20. F r = r1 + r2 = 1 + 1 = 2
F F
R
I
V
r E
V = E Ir
V = IR
F IR = E I r
Ix10 = 12 Ix2
I = 1.0 A
F F a , Ia = I = 1.0 A Ans
F Ia = Ib + Ic
1.0 = Ib + Ic
Ic = 1.0 - Ib
Vb = Vc
IbRb = IcRc
IbRb = (1.0 - Ib)Rc
Ibx4 = (1.0 - Ib)x12
Ib = = = 0.75 A Ans
Ic = 1.0 - Ib = 1.0 - 0.75 = 0.25 A Ans
F 13
F F 10 F F F F
F F 1.2 F F F 6 F F F F
F F F F F F F
F F F 6 V.
F F F F F 1.2 V. F F 10
mA.
F F www.schoolDD.com 19
21. F F F F F F F F F
F R F
VR VD
R
I F
V
E,r=0
V = VR + VD
0
V = E Ir = E
F E = VR + VD
VR = E VD = 6 1.2
VR = 4.8 V
F
VR = I R
R= =
R = 480 Ans
F 14
2 F F F F F F
. F
. F F F F
. F
. F 10
. F
R = 0.5
I=2A
r=0 R1
E=6V
.
F F F F F
I = I = 2 A Ans
F F www.schoolDD.com 20
22. . VR = ?
F V = IR
VR = 2x0.5
VR = 1.0 V Ans
. R1 = ?
E = I r + I R + I R1
6 = 2x0 + 2x0.5 + 2xR1
R1 =
R1 = 2.5 Ans
. W=? t = 10 s
W = QV
= QE
= ItE (I = )
= 2x10x6
W = 120 J Ans
. PR = ?
W = QV
P=
P=
PR = =
= I2R = 22x0.5
PR = 2 W Ans
F 15
F F F a b
I I
R1 = 1 R1 = 1
a a
E=9V E=9V
R2 = 2 R2 = 2 R3 = 2
b
b
. .
F F www.schoolDD.com 21
23. . V2 = ? I
V2 V2 = I R2
F R2 I
E V R
R1 R2 F r=0
R = R1 + R2 = 1 + 2 = 3
V = IR
0
V = E Ir
F E = IR
9 = Ix3
I =3A
V2 = I R2 = 3x2
V2 = 6 V Ans
. V2 = ?
R2 R3 F
F = + = +
Rab = 1
R1 Rab F
F R = R1 + Rab = 1 + 1 = 2
V = IR 0
V = E Ir
F E = IR
9 = Ix2
I = 4.5 A
Vab = I Rab = 4.5x1
Vab = 4.5 V Ans
16.6
F F F F F F F F
F (galvanometer) F F F
F
F F www.schoolDD.com 22
24. 16.6.1 F
F F F
R R
F A
I I
E,r E,r
F F F F
F I
F F F F F F (shunt) F
Rs F F G F F I F F F
F F IG F F F F IS
I IG RG
G
IS
RS
F
F A
F FF F F F F F F
F F F
VS = VG
ISRS = IGRG
F RS =
I = IG + IS
F 16
F F F F 1000 F 50 F
F F F 100 F
. F F F F
IG = 50 A RG = 1000
. F F F I = 100 mA
G
IS
RS = ?
F F www.schoolDD.com 23
25. . RS = ?
I = IG + IS
IS = I - IG
IS = 100x10-3 50x10-6 A
VS = VG (F )
ISRS = IGRG
RS =
= =
RS = 0.5 Ans
. RA = ?
= + ( F )
= + = =
RA = 0.5 Ans
- F F F F F F
F
16.6.2 F F
F F F F F F
F F
V
R a R
a b
b
I
I
E,r E,r
F F F F V F R
F F F
F F F F F F F
(multiplier) F Rm F F G F F F F
F Vm F F F F F VG
F F www.schoolDD.com 24
26. IG Rm RG
G
F
Vm VG
F F V
V = Vm + VG
V = IGRm + IGRG
V = IG(Rm + RG)
Rm = - RG
F FF F F F F F
F F F F F F F
F 17
F F F 16 F F F F F F 10 F
. F F F F F
. F F F F F F F F
. F F F F F
IG = 50 A Rm = ? RG = 1000
G
Vm VG
V
. Rm = ?
V = Vm + VG
V = IGRm + IGRG
10 = 50x10-6xRm + 50x10-6x1000
Rm =
Rm = 200,000 Ans
F F www.schoolDD.com 25
27. . F Rm = 0 , VG = ?
VG = IGRG
= 50x10-6x1000
VG = 50x10-3 V Ans
. RV = ?
RV = Rm + RG ( F )
= 200.000 + 1000
RV = 201,000 Ans
- F F F F F F
F
16.6.3 F F
F F
F F
R O
x R y
F
x y
F F F
F F F F G F F F R0 E
F F Rx F x y F F
F F F F F F F F F F
RG
E,r G
R0
I
x y
RX
F F O
FF
E = Vr + VRX + VRG + VR0
E = I r + I R X + I RG + I R0
F F www.schoolDD.com 26
28. E = I (r + RX + RG + R0)
I=
- x y F Rx = 0 F
( ) 0 F F F F F F x y
F 0 F F F F 0 F F F R0
0 F F F
16.7 F F F
16.7.1 F F
F (Magnet) F F F F
F F F F F
F F
1. F (magnetic pole)
F F F F F
F F
2. F
F 2 (north pole) F (south pole) F F
F F F
N
S
3. F F 2
- F F F
- F F
S N N S
F
N S S N
S N S N
F
F F www.schoolDD.com 27
29. F (magnetic field)
F F F F
F F F F
- F F F F F
- F F F F F
S
N N
N
x F F F F
F F
F F F
F
F F F FF F
F F F F F F F F F
F F F F F F F F F F F
F
S
N
F
F F
F F www.schoolDD.com 28
30. F F
F F F F F
F F (Wb)
F F F F B F F F F
F F F (T)
A (m2)
S N B=
F F (Wb)
F 18
F F 5 x 10- 4 F F F 10 F F
F F F
A = 10x10-4 m2
B=
=
B = 0.5 T Ans
= 5x10-4 Wb
F F
F F F
F F F F
v
+q F
+q v F
F F F
F F www.schoolDD.com 29
31. F F F
F = qvB
F= F F q (N)
q= F F (C)
V= (m/s)
B= F (T)
F (F) F F F (v)
F (B) F (F) F (+q)
(-q) F (F) F F
F
F
-q
+q 90° B
v
90° B
v F
v B
F 19
-1.6x 10 -19 F F 1.0x 10 7 F F
F F 5.0 x10 -3 F
F F
F = qvB
-q v =
F = Ans
F F www.schoolDD.com 30
32. F F F F
F F F F F
F
F F F F=
qvB F F
N N I
F
I B B
S S
F F F F
F F F
F = qvB ---1
I= q = It
v= =
F q v 1
F F = It( ) B
F=I B
F= F (N)
I= F (A)
= (m)
B= F (T)
(F) F F F F
F F
F ( +) F
F F www.schoolDD.com 31
33. F
F
90° B
I
I B
F 20
20 50 F 2 F 10
FF F F F ( F F F
)
F=IB
= 10x0.2x2
= 0.2
N F=4N
F
F F 2
B=2T
= ma
I = 10 A 4 = 50x10-3xa
S
a=
a = 80 m/s2 Ans
16.7.2 F F
. F
F F F F F
F F
F
I I
B
B
F F
F F www.schoolDD.com 32
34. I
I
B
B
I
I
F F F
. F F
F F F F F F
F F F F F F F F
F F F F F F F F F
F
B
N S
B
I I
F F
F F www.schoolDD.com 33
35. 16.7.3 F F F
F 2 F F F F
F F F F F F
B2 B1 B2 B1
F21 F12
F21 F12
F F
I1 I2 I1 I2
B2 B1 B2 B1
F F
I1 I2 I1 I2
. I . I
F F F F 1 F B1
F 2 F F B1 F 12 F F 2
2 F B2 F 1 F
F B2 F 21 F F 1
F F F F F
F
16.7.4 F F F F
F F F F
F F www.schoolDD.com 34
36. Q a R
I F
B B
b
F I
P S
I
F F F = I B = IbB F F
F F F F F F
F F PS QR = a
F PQ SR = b
F F F
F
S
a
B
P
F
a cos
FF = x F
M = F (a cos ) = IbB (a cos )
M = IAB cos ( A = axb = )
F N F
M = NIAB cos
F Mmax cos = 1 = 0°
Mmin cos = 0 = 90°
F 21
F 1000 F 5 8 F
F 1 F 2 F F F F
60 F
F F www.schoolDD.com 35