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Prelim_Exam__2_F05_v2

Prelim_Exam__2_F05_v2 - NAME Recitation Instructor Physics...

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NAME Recitation Instructor: Recitation Section #: Physics 112 November 3, 2005 Prelim Exam #2 7:30 - 9 PM PLEASE BE SURE THIS PACKET HAS 12 PAGES! ( This includes the cover sheet.) This packet contains 9 Short Answer Questions, 3 Problems, and a page of Possibly Useful Information. Write your answers ON THESE QUESTION SHEETS in the spaces provided. For Short Answer Questions #1-9, ONLY ANSWERS WILL BE GRADED. For Problems #10-12, 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 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): 1-2 /9 9 /12 3-4 /11 10 /16 5-6 /10 11 /20 7-8 /8 12 /14 TOTAL /100
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NAME 2 I. SHORT ANSWER [50 points] Please write your answers in the spaces provided. 1. [7 points] The potential energy U(x) of a particle that can move along the x-axis is graphed as a function of the particle's position x. The particle starts at x = - 0.4 m moving in the +x direction ( ) with kinetic energy 4.0 J, and it makes it all the way to x = + 0.4 m. U(x) (J) +x (m) 0 0.1 0.3 0.2 0.4 -0.1 -0.2 -0.3 -0.4 -1 -2 2 3 0 -3 1 For each question below, please give the entire range of answers that apply: (a) Where does the particle experience zero force? (b) Where does the particle experience a force acting in the +x direction ( )? (c) Where is the particle moving fastest? (d) When the particle reaches x = + 0.1 m, how much energy must be taken away from it so that it will be confined to x + 0.2 m? 2. [2 points] A skier starts from rest, slides down a frictionless hill, and slides off a ski jump at some oblique angle (not vertical). Which of the trajectories shown most closely resembles the one actually followed by the skier? (Neglect effects due to the air as well as friction.) (A) A (B) B (C) C Answer: H A B C Start Ski jump
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NAME 3 3. [8 points] A basketball dropped from rest bounces several times on the floor. (A) (B) (C) (D) (E) (F) (a) Which graph above best represents the ball's gravitational potential energy as a function of time? Answer: (b) Which graph best represents the ball's kinetic energy as a function of time? Answer: (c) Which graph best represents the sum of the ball's gravitational potential, kinetic, and elastic potential energies as a function of time?
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