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Unformatted text preview: fullwood (tf5349) – QUIZ 8 Work and Energy – Catala – (49033) 1 This printout should have 5 questions. Multiplechoice questions may continue on the next column or page – find all choices before answering. 001 10.0 points A rock of mass m is thrown horizontally off a building from a height h . The speed of the rock as it leaves the thrower’s hand at the edge of the building is v , as shown. m h v m What is the kinetic energy of the rock just before it hits the ground? 1. K f = mg h 1 2 mv 2 2. K f = mg h 3. K f = 1 2 mv 2 + mg h correct 4. K f = 1 2 mv 2 mg h 5. K f = 1 2 mv 2 Explanation: We can use workenergy theorem, K f K i = W , where in the present problem, W = ( mg ) h , and K i = 1 2 mv 2 . Thus, K f = K i + W = 1 2 mv 2 + mg h . Comments for Matter Interaction readers: The energy principle in MItext is referred to as the workenergy theorem in traditional text. Here the work done by the gravitational force near the surface of the earth is given by: W = ( mg )(...
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This note was uploaded on 06/10/2010 for the course PHY 100 taught by Professor Pro.kiroshima during the Spring '10 term at Adelphi.
 Spring '10
 PRO.KIROSHIMA
 Energy, Mass, Work

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