Prelim_Exam__2_F04_v2 - NAME Recitation Instructor: Physics...

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NAME Recitation Instructor: Recitation Section #: Physics 112 November 4, 2004 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 4 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 #1-4, ONLY ANSWERS WILL BE GRADED. For Problems #5-8, 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: 1-2 /12 5 /10 3 /16 6 4 7 /18 8 TOTAL /100
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NAME 2 I. SHORT ANSWER [40 points] Please write your answers in the spaces provided. 1. [12 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. 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 The particle starts at x = - 0.4 m moving in the +x direction with a kinetic energy of 4.0 J, and it makes it all the way to x = + 0.4 m. For each question below, please give all answers that apply. (a) Where does the particle experience zero force ? (b) Where is the force on the particle to the left ( )? (c) Where does the particle have the greatest acceleration in the +x direction ( (d) Where is the particle moving fastest ? (e) When the particle reaches x = + 0.1 m, how much energy would have to be taken away from it so that it would be confined to x + 0.3 m?
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NAME 3 2. [10 points] True/False (Please circle your answers.) (a) The maximum speed that a rocket can attain by ejecting burnt fuel at a speed of v ex relative to the rocket is v ex .T F (b)
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This note was uploaded on 03/27/2008 for the course PHYS 1112 taught by Professor Leclair,a during the Spring '07 term at Cornell University (Engineering School).

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Prelim_Exam__2_F04_v2 - NAME Recitation Instructor: Physics...

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