his friend’s house. He has to exert a 110 N horizontal force to push the car at a constant speed. How much thermal energy is created in the tires and road during this short trip? thermal energy is created in the tires and road = 110 * 150 =16500 J A 30 kg child slides down a playground slide at a constant speed. The slide has a height of 4.0 m and is 7.0 m long. Using energy considerations‚ find the magnitude of the kinetic friction force acting on the child. The friction force F is parallel
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Experiment 4: Work‚ Power and Energy Maria Isabela Mendoza‚ Carmela Miranda‚ Arianne Nagrampa‚ and Vivien Oreo Department of Biological Sciences University of Santo Tomas España‚ Manila‚ Philippines Abstract The experiment performed involved work‚ power and energy. On the first activity‚ the time it took for each member to go up and down the stairs was recorded. Afterwards‚ the work and power done were computed. The most powerful member in the group was student number 2 with power outputs of 239
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POTENTIAL ENERGY DIAGRAM In physics the terms of mechanical energy usually refers to Potential energy (U) and Kinetic Energy (K). In the absence of non-conservative‚ or dissipative forces‚ these energies obey the law of conservation of energy‚ or ΔU + ΔK = 0. That is‚ when a system is only acting under the influence of conservative forces its total energy content never changes‚ the energy just converts between forms. At any point in the cycle‚ the total energy is constant‚ U + K = Umax = Kmax
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ENERGY: Energy is the amount of force or power when applied can move one object from one position to another or Energy defines the capacity of a system to do work. Energy exists in everybody whether they are human beings or animals or non-living things for e.g.: Jet‚ Light‚ Machines etc... Energy can have many forms: kinetic‚ potential‚ light‚ sound‚ gravitational‚ elastic‚ electromagnetic or nuclear. The many different natural and renewable energy technologies are by no means breakthrough. Many
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Work and Energy Worksheet Section 1 Work: 1. A person pulls a toboggan for a distance of 35.0m along the snow. The force in the rope (tension) is 94.0N. How much work is done on the sled? Solution: W= Fd W= 94.0N x 35.0m W= 3290 Nm or J 2. The cable of a large crane applies a force of 2.2x10^4N to a demolition ball as it lifts it vertically a distance of 7.6m. a) How much work is done on the ball? b) Is the work positive or negative? Why? Solution:
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Calories: The name calorie is used for two units of energy. Although these units are part of the metric system‚ they have been superseded in the International System of Units by the joule. One small calorie is approximately 4.2 joules. Calories are also most known to be used in foods and diet‚ which is key to athletes. Joules: A Joule is equal to the energy transferred to an object when a force of one newton acts on that object in the direction of its motion through a distance of one metre. Kilocalories:
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Forms of Energy Energy Is the capacity to cause change Exists in various forms‚ of which some can perform work Kinetic energy Is the energy associated with motion Potential energy Is stored in the location of matter Includes chemical energy stored in molecular structure AP Biology 1 Division Ave. High School Ms. Foglia AP Biology Energy can be converted From one form to another On the platform‚ a diver has more potential energy. Climbing
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Global energy crisis By Irshad Ali Sodhar (FSP) Outline 1. Introduction 2. What is energy crisis? 3. Share of energy resources in energy supply a) Non-renewable b) Renewable 4. World consumption distribution 5. World production distribution 6. Causes of crises a) Surge in demand b) Resource nationalism – tighter supply c) Political uncertainty d) Lack of diversity 7. Impact of crises a) Economy b) Politics c) Development 8. Environmental concerns 9. Way
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disk of radius R = 0.25 m has a string wrapped around it‚ and a m = 3 kg weight is hanging on the string. The system of the weight and disk is released from rest. a) When the 3 kg weight is moving with a speed of 2.2 m/s‚ what is the kinetic energy of the entire system? KETOT = KEwheel+KEweight = (1/2)(I)(w2)+(1/2)(m*v2) =(0.5* v2)(m+1/2M) =0.5*(2.2^2)*(3+(.5*15)) J b) If the system started from rest‚ how far has the weight fallen?
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“wireless”. They are not “hooked up” to external sources of power. Solar lights produce no pollution and cause no harmful environmental effects. Once installed‚ energy is free Fourteen solar farms have a combined installed capacity of 388.4 megawatts and in 2011 generated 0.1 billion kilowatt-hours. (Source: Canadian Centre for Energy Information compilation‚ 2013) There are now 3‚133 megawatts of solar power installed in the U.S. That’s enough to power nearly 3 million homes. The average cost
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