A man stands on a platform that is rotating (without friction) with an angular speed of 0.618 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 6.20 kg-m2. If by moving the bricks the man decreases the rotational inertia of the system to 1.66 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? (a) Number i ! Units rad/s (b) Number 3.74 Units No units

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