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Unformatted text preview: Your Name Recitation Instructor's Name: Recitation Section #: Physics 112 October 4, 2005 Prelim Exam #1 7:30 - 9 PM PLEASE BE SURE THIS PACKET HAS 12 PAGES ! ( This includes the cover sheet.) This packet contains 9 Short Answer Questions , 4 Problems , and a page of Possibly Useful Information . Write your answers ON THESE QUESTION SHEETS in the spaces provided. For Short Answer Questions #1-8, ONLY ANSWERS WILL BE GRADED, unless calculations or constructions are explicitly requested. For Problems #9-12, 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 receive credit (except for short answer questions). WORK ON SCRAP PAPER WILL NOT BE GRADED. Point values for questions are given by each problem and 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 a CLOSED BOOK and CLOSED NOTES exam. You may NOT use any other references or personal assistance. You MAY use a NON-GRAPHING calculator. You may NOT use energy methods. For Grading Only: 1-2 /12 9 /12 3-4 /6 10 /18 5-6 /13 11 /12 7-8 /9 12 /18 TOTAL /100 Your Name 2 SHORT ANSWER [40 points] Please mark letters of your answers in spaces provided. 1. [4 points] Four identical ideal springs, each having spring constant k, are connected as shown. The left end of this assembly is attached to a fixed wall. (a) What is the effective spring constant of this combination of springs? (A) k/4 (D) 2k Answer: (B) k/2 (E) 4k (C) k (F) other (Please specify other value: ) (b) Why is the force acting on the left end of this combination due to the wall equal in magnitude to the force F pulling on the right end? (A) This arrangement is symmetric left-to-right. Answer: (B) The spring has zero acceleration. (C) These two forces are 3rd Law interaction partners. (D) These two forces are NOT equal....
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