Prelim_Exam__2_S05

# Prelim_Exam__2_S05 - NAME Recitation Instructor Physics 112...

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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?
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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