3 Work‚ Power and Energy At the end of this section you should be able to: a. b. c. d. e. f. describe potential energy as energy due to position and derive potential energy as mgh describe kinetic energy as energy due to motion and derive kinetic energy as mv2/2 state conservation of energy laws and solve problems where energy is conserved define power as rate of energy transfer define couple‚ torque and calculate work done by variable force or torque solve problems where energy is lost due to friction
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Energy and Fossil Fuels January 30‚ 2012 I will be covering different types of energy and how they are converted into other forms of energy. I will also discuss what fossil fuels are‚ alternatives to fossil fuels and the advantages and disadvantages of alternatives. There are several different forms of energy and how it can be converted from one type to another. According to The Law of Conservation of Energy; energy can neither be created or destroyed‚ only transferred
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mass m initially at speed u collides head-on (without rotation) with a stationary puck of mass M. Find the velocities of both puck after the collision if: i) the collision is fully elastic ii) the collision if fully inelastic. i) momentum: kinetic energy: mu = mv+MV (+ve in direction of initial u) 1 /2 m u2 = 1/2 m v2 + 1/2 M V2 2 eqns in 2 unknowns: V = (u - v) m/M substitute in K eqn: u2 = v2 + (M/m) V2 = v2 + (M/m) (u - v)2 (m/M)2 = v2 + (u - v)2 (m/M) let ρ = (m/M) ⇒ v2 (1 + ρ) - 2ρ u v + u2
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Mass–energy equivalence From Wikipedia‚ the free encyclopediaJump to: navigation‚ search "E=MC2" redirects here. For other uses‚ see E=MC2 (disambiguation). 3-meter-tall sculpture of Einstein’s 1905 E = mc2 formula at the 2006 Walk of Ideas‚ Berlin‚ GermanyIn physics‚ mass–energy equivalence is the concept that the mass of a body is a measure of its energy content. In this concept the total internal energy E of a body at rest is equal to the product of its rest mass m and a suitable conversion
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Energy crises of Pakistan By Sahibzada Hussain Mohi-ud-Din Qadri The unabated spate of load shedding throughout Pakistan has made life difficult to live in this sizzling summer. The unending energy crisis with power outages for more than 15 hours on daily basis has also dealt a severe blow to the national economy. Resultantly‚ business units and factories are getting shut down and layoffs of the workers are reported to be running in hundreds of thousands with grave implications for already burgeoning
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Potential Energy: Potential energy is the stored energy of position possessed by an object. Potential Energy Formula : Potential Energy: PE = m x g x h Mass: Acceleration of Gravity: Height: where‚ PE = Potential Energy‚ m = Mass of object‚ g = Acceleration of Gravity‚ h = Height of object‚ Examples: 1. A cat had climbed at the top of the tree. The Tree is 20 meters high and the cat weighs 6kg. How much potential energy does the cat have? m = 6 kg‚ h = 20
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report presents the emphasis on implementation of renewable energy resources in India. A detailed analysis of the renewable energy sector shows there are less policies and investments in the innovation of this energy. India has limited energy resources and one day it will only depend on renewable energy resources. For this‚ Indian government should implement several measures like sustainable planning; reasonable budget etc. so that renewable energy sources optimally utilized and conserves natural resources
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source of energy? Energy is essential for life. We use it in factories‚ in cars‚ airplanes‚ trains and ships. To heat food‚ light our houses etc. However‚ energy consumption is different in different countries. Since always human beings have used energy sources to do work or produce heat. Firstly‚ they used domestic animals or their physical forces. After‚ they used the wind and the water. Then‚ they exploited the use of fossil fuels and nuclear energy. In the near future we hope new energy sources
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Energy as the Defining Component in EU-Russian Relations After the Eastern EU Enlargement Marek Neuman* University of Groningen m.neuman@rug.nl * Marek Neuman is a PhD student at the University of Groningen‚ Groningen‚ The Netherlands. This paper has been presented at the Fourth Pan-European Conference on EU Politics held on 25 - 27 September 2008 at the University of Latvia‚ Riga‚ Latvia. Please do not distribute or quote without permission of the author. Introduction Since the
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The European Energy Market For several years now the European Union‚ the largest regional trading block in the world‚ has been trying to liberalize its energy market‚ replacing the markets of its 27 member states with a single continent wide market for electricity and gas. The first phase of liberalization went into effect in June 2007. When fully implemented‚ the ability of energy producers to sell electricity and gas across national borders will be improved‚ increasing competition. The road
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