Calculating Efficiency. Efficiency (%) = Useful Energy Out x 100 Total Energy In Questions 1) A light bulb takes in 30J of energy per second. It transfers 3J as useful light energy and 27J as heat energy. Calculate the efficiency. 2) A kettle takes in 2000J of energy per second. It transfers 1500J as useful heat energy and 500J is wasted as sound energy. Calculate the efficiency of the kettle. Remember: In the exam they may not
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and businesses‚ geothermal power plants use superheated fluids from the earth’s geothermal energy to generate electricity. When magma heats up the water from underground‚ it creates superheated fluids. When these super-heated fluids reach the surface they will be turned into steam. This steam will then power a turbine‚ which will in turn power a conductor. The conductor will then produce electrical energy. ¬¬¬¬¬¬To create enough steam to power the steam turbines‚ the superheated fluid must
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kilogram is launched horizontally with a velocity of 30 meters per second at time t = 0 as shown above. The potential energy of the ball is zero at the bottom of the cliff. Use g = 10 meters per second squared. a. Calculate the potential‚ kinetic‚ and focal energies of the ball at time t = O. b. On the axes below‚ sketch and Label graphs of the potential‚ kinetic‚ and total energies of the ball as functions of the distance fallen from the top of the cliff cliff cliff c.
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Down the Hill Lab Report Kinetic & Potential Energy Name: Corinne Chen Block: 1 – 3 Date: May 22nd‚ 2013 Purpose: To investigate and compare the potential energy‚ kinetic energy and speed of a cart on a hill 1 kg h 1 m Materials: 1. 2. Cart & 1 kg mass 3. Board 4. Timer
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WHAT IS TORQUE? Torque is a measure of how much a force acting on an object causes that object to rotate. The object rotates about an axis‚ which we will call the pivot point‚ and will label ’O ’. We will call the force ’F ’. The distance from the pivot point to the point where the force acts is called the moment arm‚ and is denoted by ’r ’. Note that this distance‚ ’r ’‚ is also a vector‚ and points from the axis of rotation to the point where the force acts. (Refer to Figure 1 for a pictoral
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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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SCIENCE INFORMATIC WS011 CONSERVATION OF ENERGY GROUP MEMBER: 1. ADRIAN HO IK LIANG (MS0915542624) 2. MOHD. TARHAMIZI BIN ABD HAMID ( MS0915515816) 3. ZURINAH BINTI PAKEE ( MS0915517005) 4. DESMOND ANAK BONNIK (MS0915514779) 5. ELMA LIM ( MS0915514865) LECTURER ’S NAME: MR. SYED NASIR BIN SYED AHMAD Content Title INTRODUCTION POTENTIAL ENERGY GRAVITATIONAL POTENTIAL ENERGY ELASTIC POTENTIAL ENERGY KINETIC ENERGY PRINCIPLE OF CONSERVATION ENERGY WORK-ENERGY THEROM CONCLUSION BIBLIOGRAPHY Page 1
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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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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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of the item. (c) (i) The energy on impact is calculated by using the following equations: Potential Energy (PE) = mass x gravity x height This gives the potential energy at the height when the ball is held at the start of the test. This can be used as a check to for the Kinetic energy (KE) equation as the law of energy conversation states that energy may neither be created nor destroyed. Therefore the sum of all the energies in the system is a constant. So the
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