2048_Spring09_Exam3

# 2048_Spring09_Exam3 - 77777 Instructor(s...

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77777 77777 1. A 100-N uniform plank leans against a frictionless wall as shown. The magnitude of the torque (about the point P) applied to the plank by the wall is: (1) 150 N · m (2) 100 N · m (3) 500 N · m (4) 66.7 N · m (5) 75 N · m 2. The ideal mechanical advantage is deﬁned to be the ratio of the weight W to the force of the pull F P for equilibrium (i.e. W/F P in equilibrium). Assuming that the pulleys rotate without friction and without the rope slipping, what is the ideal mechanical advantage of the combination of pulleys shown in the ﬁgure? (1) 4
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## This note was uploaded on 01/25/2011 for the course PHY 2048 taught by Professor Field during the Summer '08 term at University of Florida.

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2048_Spring09_Exam3 - 77777 Instructor(s...

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