A man stands on a frictionless platform that is rotating, Physics

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A man stands on a frictionless platform that is rotating

A man stands on a frictionless platform that is rotating with an angular speed of 3.3 rad/s; his arms are outstretched and he holds a weight in each hand. With his hands in this position the rotational inertial of the system of man, weights, and platform is 4.3 kg*m2. If by moving the weights the man decreases the rotational inertial of the system to 1.8 kg*m2, what is the resulting angular speed of the platform? which is = 7.8833 rad/s

1) What is the change of the kinetic energy when the man moves his arms?

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