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Unformatted text preview: Morby, Grant Homework 25 Due: Apr 3 2006, noon Inst: Drummond 1 This printout should have 16 questions. Multiplechoice questions may continue on the next column or page find all choices before answering. The due time is Central time. 001 (part 1 of 3) 10 points A string is wrapped around the stem of a Yo Yo which has a mass M and a moment of inertia I about its center axis. The radius of the stem is r 1 and the radius of the disk is r 2 . Denote the tension of the string T and the descending acceleration a . h r 2 r 1 M The correct torque equation is given by 1. T r 1 = 2 a I r 1 + r 2 . 2. T r 1 + r 2 2 = 2 a I r 2 . 3. T r 1 + r 2 2 = 2 a I r 2 r 1 . 4. T r 1 = a I r 1 . 5. T r 1 + r 2 2 = 2 a I r 1 . 6. T r 2 r 1 2 = 2 a I r 1 + r 2 . 7. T r 1 + r 2 2 = 2 a I r 1 + r 2 . 8. T r 2 = a I r 2 . 9. T r 2 = 2 a I r 1 + r 2 . 002 (part 2 of 3) 10 points The correct vertical force equation is given by 1. M g + T = M a . 2. M g T = M a . 3. T M g = M a . 003 (part 3 of 3) 10 points Release the YoYo from rest. It reaches a center of mass speed v when it falls for a height h . Using the same notation as in the previous questions, the correct workenergy equation is given by 1. 1 2 M v 2 = 1 2 Iv 2 . 2. 1 2 M v 2 = 1 2 I v r 1 2 ....
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This note was uploaded on 03/02/2009 for the course PHY 58235 taught by Professor Kleinman during the Spring '09 term at University of Texas at Austin.
 Spring '09
 KLEINMAN
 Physics, Work

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