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Midterm3_Fall_09_key_final

# Midterm3_Fall_09_key_final - PHY 2048-S4 Fall 2009...

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PHY 2048-S4, Fall 2009 Examination #3 November 19, 2009 Instructor: Beatriz Roldan Cuenya Name______________________________________ID______________ Please answer all questions. #1______________ #2______________ #3______________ #4______________ Total: ___________ Show all work and enter answers in boxes, if provided.

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1. Two particles of masses m 1 = 3 kg and m 2 = 0.5 kg slide in opposite directions over a frictionless surface with constant velocities v 1 = 1.5 m/s and v 2 = -5 m/s, respectively. The particles collide and bounce as it is indicated in the figure below. If the magnitude of the velocity of particle 1 after the collision is 0.4 m/s, determine: (a) Velocity (magnitude and direction) of particle 2 after colliding with particle 1. (10 points) (b) Kinetic energy lost during the collision. (10 points) (a) (b) y x 1 2 35º φ 1
2. (a) The angular speed of a point on the rim of a rotating wheel is given by: ω = bt - ct 2 , where t is in seconds, b= 2 rad/s 2 and c= 5 rad/s 3 . Find an expression for the angular acceleration as a function of time. Assume that ω =0 rad/s at t=0 s. (5 points)

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Midterm3_Fall_09_key_final - PHY 2048-S4 Fall 2009...

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