Final_S02 - Your Name Recitation Instructor's Name Physics...

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Your Name Recitation Instructor's Name: Recitation Section: Physics 112 May 9, 2002 Final Exam 9 - 11:30 am PLEASE BE SURE THIS PACKET HAS 16 PAGES. (This includes the cover sheet and two scrap pages.) This packet contains 7 Short Answer Questions, 7 Problems, a page of Possibly Useful Information, and two pages of scrap paper. Write your answers ON THESE QUESTION SHEETS in the spaces provided. For Short Answer Questions #1-7, ONLY ANSWERS WILL BE GRADED. For Problems #8-14, where algebra or computations are required, BE SURE YOUR METHOD OF SOLUTION IS CLEAR, and SHOW YOUR WORK in the spaces provided. If you need more space, use the backs of the question sheets and indicate the whereabouts of your work for each question. ANSWERS WITHOUT WORK WILL NOT GET CREDIT (except for short answer questions). WORK ON SCRAP PAPER WILL NOT BE GRADED. Point values for questions are given below. BUDGET YOUR TIME. Don't spend too much time on any one question or part of a question. Answer those questions you can do easily first, and then return to the more difficult ones. It is valuable use of your time to READ THE ENTIRE EXAM BEFORE STARTING TO WORK ON IT. This is CLOSED BOOK and CLOSED NOTES exam. You may NOT use any other references or personal assistance. You may use a calculator. For Grading only: 1 /8 10 /8 2-4 /11 11 /10 5-7 /11 12 /8 8 /10 13 /8 9 /10 14 /16
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Your Name 2 TOTAL /100
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3 I. SHORT ANSWER (30 Points) For multiple-choice questions, circle the correct answer. For all other questions, write your answers in the spaces provided. Warm-up Question: Which is your right hand? 1. [8 points] A spinning wheel is suspended from a point on its axle by a rope hung from the ceiling, as shown. The ends of the axle (points A and B) are equidistant from the center of the wheel, while the rope is connected at a point halfway between A and the center. The wheel's center-of-mass is also at its center. As seen from above (looking down along the rope), the wheel precesses clockwise ( ). In other words, point B is moving out of the page in the Side View shown here. (a) If the wheel's spin rate (angular speed) were doubled, how would its precession rate change? (Please circle your answer.) decrease × 1/4 decrease × 1/2 no change increase × 2 increase × 4 (b) In which direction should you apply a force at point B on the right end of the axle in order to stop the wheel's precession? (Please circle your answer.) into the page out of the page (c) In terms of the wheel's weight w, what is the magnitude F of the force you need to apply at B in order to stop the wheel's precession? F = (d) As seen from point B, which way is the wheel spinning? (Please circle your answer.)
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Final_S02 - Your Name Recitation Instructor's Name Physics...

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