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July 25, 2014

Homework Help: Physics- Angular Momentum

Posted by Miki on Tuesday, December 28, 2010 at 3:22pm.

A long thin rod of mass M=2.00 kg and length L=75.0 cm is free to rotate about its center. Two identical masses (each of mass m = .45kg) slide without friction along the rod. The two masses begin at the rod's point of rotation when the rod is rotating at 10.0 rad/s.

A) When they have moved halfway to the end of the rod, how fast (rad/s) is the rod rotating?

B) When the masses are halfway to the end of the rod, what is the ratio of the final kinetic energy to the initial kinetic energy (Kf/Ki)?

C) When they reach the end, how fast is the rod rotating (rad/s)?

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