2009_2nd_exam_ PHYSICS 211_Summer-SOLUTION

2009_2nd_exam_ PHYSICS 211_Summer-SOLUTION - Exam #2...

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Unformatted text preview: Exam #2 PHYSICS 211 Monday July 6 th , 2009 NAME ____________________________ Please write down your name also on the back page of this exam 1. The figure gives how the force varies as a function of the position. Such force is acting on a particle, which undergoes one-dimensional motion. If the particle begins at rest at x=0, 1A Find the x coordinate at which the particle has the greatest kinetic energy ANSWER x = 3 m 1B Find the x coordinate at which the particle has zero speed ANSWER x = 6 m 1 N x (m) 2 N -2 N -1 N 0 1 2 3 4 5 6 7 F ______________________________________________________________________________ 2. At t=0 two small objects A and B of the same mass m are thrown simultaneously from the level z=0 and with the same initial speed of 10 m/s (the initial velocity makes 45 o with the horizontal.) Object-A travels free in the air (its trajectory is indicated in the graph) while object-B moves along a frictionless surface of a 45 o ramp. z = 0 z = h 1 m m A B 2A Lets call h 1 the maximum height reached by the object-A. Calculate the horizontal component of the velocity of the object-A when it passes by the maximum height h 1 . ANSWER _____ 7.1 m/s ____________ 2B Calculate the x-component of the velocity of the object-B when it passes by the height level z= h 1 . ANSWER _____ 5 m/s _____________ ______________________________________________________________________________ 3. At t=0 two small objects A and B of the same mass m are thrown simultaneously from the level z=0 and with the same initial speed of 10 m/s (the initial velocity makes 45 o with the horizontal.) Object-A travels free in the air (its trajectory is indicated in...
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2009_2nd_exam_ PHYSICS 211_Summer-SOLUTION - Exam #2...

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