Prelim_Exam__2_F04_v2

# Prelim_Exam__2_F04_v2 - NAME Recitation Instructor: Physics...

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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?
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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