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A freely spinning wheel of mass M and radius R and moment of inertia I has...

A freely spinning wheel of mass M and radius R and moment of inertia I has its center attached to a fixed point a distance H above the ground. A thin thread is wrapped around the edge of the wheel, and connected to a mass, M (same as the wheel). When the mass is released from rest, it falls the distance H in a time delta t.

In terms of M, g, I and H, how much time, delta t, does this process take?

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