A long thin rod of mass m 200 kg and length l 750 cm is, Ask an Expert

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A long thin rod of mass M = 2.00 kg and length L = 75.0 cm is free to rotate about its center as shown. Two identical masses (each of mass m = .413 kg) 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)?

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