Question #27524

A circular disc rotates on a thin air film with a period of 0.3 s. Its moment of inertia about its axis
of rotation is 0.06 kg m2. A small mass is dropped onto the disc and rotates with it. The moment
of inertia of the mass about the axis of rotation is 0.04 kg m2. Determine the final period of the
rotating disc and mass.

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