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July 25, 2014

Homework Help: Physics

Posted by Charlie on Monday, April 23, 2012 at 7:57pm.

A merry-go-round with r = 4m and a perfect frictionless bearing is pushed with a force of 24 N by a young girl. She pushes with a constant force that is oriented tangentially to the edge of the merry-go-round. After she pushes the merry-go-round through 14 full rotations (at which point she lets go) it is spinning with an angular speed of 3 rad/s.
a. What is the moment of inertia of the merry-go-round?
b. After the girl lets go, a 20 kg boy jumps onto the merry-go-round and sticks halfway between the center of the edge. How fast are the merry-go-round and the boy spinning after he lands?

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