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124_s09_fin

# 124_s09_fin - Physics 124 2009 Final 4-7 PM Tuesday College...

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1. If you put a uniform block at the edge of a table, the center of the block must be over the table for the block not to fall oF. Now you stack two identical blocks at the table edge (see the ±igure). In terms of the length L of each block, what is the maximum overhang possible? a) L/ 2 b) 3 L/ 4 c) L d) 5 L/ 4 e) 3 L/ 2 2. A runner of mass 60 kg runs around the edge of a horizontal turntable mounted on a vertical frictionless axis through its center. The runner’s velocity relative to the earth has magnitude 3 m/s. The turntable is rotating in the opposite direction with an angular velocity of magnitude 0.2 rad/s relative to the earth. The radius of the turntable is 3 m, and its moment of inertia about the axis of rotation is 85 kg · m 2 . ±ind the ²nal angular velocity of the system if the runner comes to rest relative to the turntable. (You can treat the runner as a particle.)
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124_s09_fin - Physics 124 2009 Final 4-7 PM Tuesday College...

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