Prelim_Exam__2_S05

Prelim_Exam__2_S05 - NAME Recitation Instructor Physics 112...

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NAME Recitation Instructor: Recitation Section #: Physics 112 April 7, 2005 Prelim Exam #2 7:30 - 9 PM PLEASE BE SURE THIS PACKET HAS 12 PAGES! ( This includes the cover sheet and two scrap pages.) This packet contains 5 Short Answer Questions, 3 Problems, and a page of Possibly Useful Information. There is also a page of scrap paper near the end. Write your answers ON THESE QUESTION SHEETS in the spaces provided. For Short Answer Questions #1-5, ONLY ANSWERS WILL BE GRADED. For Problems #6-8, 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 NON-GRAPHING calculator. For Grading Only (Do not write here): 1 /12 6 /14 2 /20 7 /20 3 /9 8 /16 4-5 /9 TOTAL /100
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NAME 2 I. SHORT ANSWER [50 points] Please write your answers in the spaces provided. 1. [12 points] The potential energy U(x) (in J) of a particle of mass 0.25 kg that can move along the x-axis is graphed as a function of the particle's position x (in m). 0.1 0.2 0.3 0.4 0.5 -0.5 -0.4 -0.3 -0.2 -0.1 0 0 1 2 3 4 - 1 - 2 - 3 - 4 x (m) U(x) (J) For each question below, please give ALL answers that apply. Please round your answers for position (x) values to the nearest 0.1 m. (a) Where (x = ?) are points of stable equilibrium? (If none, write NONE.) (b) Where is the force on the particle directed to the right ( )? (If nowhere, write NOWHERE.) (c) Where would the magnitude of particle's acceleration be the greatest? (d) If the particle were at x = -0.2 m moving to the right ( ), how much kinetic energy would it need to have there in order to make it all the way to x = +0.5 m? (e) If the particle started at x = -0.2 m moving to the right ( ) with just enough kinetic energy to make it all the way to x = +0.5 m, how fast (in m/s) would it moving at x = +0.5 m?
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NAME 3 2. [20 points] True/False (Please circle your answers, T or F.) (a) When moving object A collides elastically with stationary object B, it is possible for object B's speed after the collision to be greater in magnitude than object A's speed before the collision. T F (b) When moving object A collides elastically with stationary object B, it is possible for object B's momentum after the collision to be greater in magnitude than object A's momentum before the collision.
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