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Prelim_Exam__2_Spr04_v2

Prelim_Exam__2_Spr04_v2 - NAME Recitation Instructor...

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NAME Recitation Instructor: Recitation Section #: Physics 112 April 8, 2004 Prelim Exam #2 7:30 - 9 PM PLEASE BE SURE THIS PACKET HAS 11 PAGES! ( This includes the cover sheet and two scrap pages.) This packet contains 6 Short Answer Questions, 4 Problems, and a page of Possibly Useful Information. There are also two pages of scrap paper near the end. Write your answers ON THESE QUESTION SHEETS in the spaces provided. For Short Answer Questions #1-6, ONLY ANSWERS WILL BE GRADED. For Problems #7-10, 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 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 calculator. For Grading Only: 1-3 /12 7 /18 4-5 /16 8 /16 6 /12 9 /14 10 /12 TOTAL /100
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NAME 2 I. SHORT ANSWER [40 points] Please write your answers in the spaces provided. 1. [6 points] Two identical balls start from rest at the same time at the same height on two side-by side ramps. One ball rolls along path A, while the other ball rolls along path B, always staying in contact with the ramp, as demonstrated in lecture. (a) Which ball gets to the end of the ramps first? (A) The one on path A (B) The one on path B (C) Both get there at the same time. Answer: (b) Which ball gets the end of the ramps with the greater speed? (A) The one on path A (B) The one on path B (C) Both get there with the same speed. Answer: 2. [3 points] An ice sailboat is stalled on a frozen lake on a windless day. A large fan is turned on to blow air into the sail. If all the wind from the fan strikes the sail and bounces backwards ( ), as demonstrated in lecture, which way will the craft move?
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