87. assignment (conservation of angular momentum)

A physics student is sitting on a frictionless platform that is rotating with an angular speed of wi = 2.8 rad/s. His arms are outstretched, and he is holding a heavy weight in each hand. The moment of inertia of the student, the extended weights, and the platform about the rotation axis is Ii = 12.5 kg*m2. When the student pulls the weights inward toward his body, the moment of inertia decreases to If = 5.7 kg*m2.

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