By moving the bricks the man decreases the rotational

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Reference no: EM13626615

A man stands on a platform that is rotating (without friction) with an angular speed of 1.2 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 vertical axis of the platform is 5.0 kg·m². By moving the bricks the man decreases the rotational inertia of the system to 2.0 kg·m².

(a) What is the resulting angular speed of the platform?

(b) What is the ratio of the new kinetic energy of the system to the original kinetic energy?

Reference no: EM13626615

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