PHYS 2101 Chapter : Quest 7 8s
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Chapter 7 and 8 questions: in the gure below, a greased trunk can slide to the ground along the three frictionless slides, starting from rest. Rank the slides according to (a) how much work the gravitational force does on the trunk during the decent, (b) the trunk"s nal speed, and (c) the time it takes to slide to the ground, greatest. Rst. (a) the work done by the gravitational force is the same because all three slides have the same height. Answer: a = b = c (b) the nal speed is the same because. W = k = kf ki = kf 0 = kf = 2 mv2 f , so the same work means the same nal speed. (b) (c) (c) the lengths of the slides (lc > lb > la) are related to vf and t as: l = vavgt = the larger the length the larger the time.
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