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A thin hoola-hoop of diameter D and mass M is hanging on a small nail on...

A thin hoola-hoop of diameter D and mass M is hanging on a small nail on the wall so that it can rotate back and forth about the pivot point (the small nail). What is the moment of inertia of the hoola-hoop about the small nail?

a) I = (1/4)MD2

b) I = (1/2)MD2

c) I = (3/4)MD2

d) I = MD2

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