Final_S03 - Your Name Recitation Instructor's Name: Physics...

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Your Name Recitation Instructor's Name: Recitation Section: Physics 112 May 13, 2003 Final Exam 9 - 11:30 AM PLEASE BE SURE THIS PACKET HAS 17 PAGES. (This includes the cover sheet and two scrap pages.) This packet contains 11 numbered Questions and Problems, 2 pages of scrap paper, and 3 pages of Possibly Useful Information. Write your answers ON THESE QUESTION SHEETS in the spaces provided. For Short-Answer questions, ONLY ANSWERS WILL BE GRADED. For Problems, 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 receive credit (except for Short Answer questions). WORK ON DETACHED SCRAP PAPER WILL NOT BE GRADED. Point values for questions are given with each question. 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: 1-6 /35 9 /12 7 /10 10 /12 8 /18 11 /13 TOTAL /100
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Your Name 2 I. SHORT ANSWER [35 points] Write your answers in the spaces provided. 1. An ideal spring of spring constant k 1 is cut in half, and then the two halves are connected as shown. k 1 k eff = ? What is the effective spring constant k eff of this new arrangement? (A) k 1 /4 (E) 2 k 1 answer: (B) k 1 /2 (F) 2k 1 (C) k 1 / 2 (G) 4k 1 (D) k 1 2. A uniform hoop of radius R swings as a physical pendulum through small angle oscillations about a pivot on its circumference. How does the period of this hoop pendulum compare with the period of a simple pendulum of length R swinging with the same amplitude? answer: (A) Hoop pendulum's period is shorter than the simple pendulum's. (B) Hoop pendulum's period is the same as the simple pendulum's. (C) Hoop pendulum's period is longer than the simple pendulum's. (D) It depends on which one has the greater mass. 3. (a) By sticking pieces of mass at points A on the tips of the prongs of a tuning fork, where the greatest vibration takes place, how is the fork's oscillation frequency changed? answer: (A) The frequensy is lowered . (B) The frequency is not changed noticeably. (C) The frequency is raised . (b) By sticking pieces of mass on to the fork at points B near the base of the prongs where no motion is taking place, but bending is, how is the fork's oscillation frequency changed? (A) The frequensy is lowered . answer: (B) The frequency is not changed noticeably. (C) The frequency is raised . R Pivot A A B B
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Your Name 3 4. A spinning bicycle wheel of radius R and total mass M is spinning at the middle of a frictionless axle of length H whose lower end is resting on a fixed frictionless pivot. The wheel is also precessing steadily around the pivot.
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Final_S03 - Your Name Recitation Instructor's Name: Physics...

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