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Unformatted text preview: ikram (ai2734) hw1006 Swinney (58785) 1 This printout should have 7 questions. Multiplechoice questions may continue on the next column or page find all choices before answering. Some of these problems can be worked using Newtons laws as easily as using the WorkEnergy Theorem. However, it is recom mended that you use the WorkEnergy Theo rem. We will soon examine problems where it would not be possible to solve them directly from Newtons laws, yet the problem can be rather simple to solve using the WorkEnergy Theorem. 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 throwers 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 2. K f = 1 2 mv 2 + mg h correct 3. K f = 1 2 mv 2 mg h 4. K f = 1 2 mv 2 5. K f = mg h 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 . 002 (part 1 of 3) 10.0 points Two students ride in carts opposite to one another in a spinning ferris wheel as shown below. b b b b b b R B A v Student A is originally at the bottom of the ferris wheel while student B is at the top of the ferris wheel. As the wheel turns, student B comes to the bottom while student A arrives at the top, as shown below....
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 Spring '07
 Swinney
 mechanics, Work

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