A man stands on a platform that is rotating (without friction) withan angular speed of 1.94 rev/s; his arms are outstretched and heholds a brick in each hand. The rotational inertia of the systemconsisting of the man, bricks, and platform about the central axisis 5.60 kg·m2. If by moving the bricks the mandecreases the rotational inertia of the system to 2.33kg·m2,
(a) what is the resulting angular speed of the platform and
(b) what is the ratio of the newkinetic energy of the system to the original kinetic energy?