A what is the resulting angular speed of the platform and b

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A man stands on a platform that is rotating (without friction) with an angular speed of 0.639 rev/s; his arms are outstretched and he holds a brick in each hand. The rotational inertia of the system consisting of the man, bricks, and platform about the central axis is 7.76 kg·m². If by moving the bricks the man decreases the rotational inertia of the system to 1.33 kg·m², (a) what is the resulting angular speed of the platform and (b) what is the ratio of the new kinetic energy of the system to the original kinetic energy?

Reference no: EM13625086

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