The outstretched hands and arms of a figure skater preparing for a spin can be c

Question

The outstretched hands and arms of a figure skater preparing for a spin can be considered a slender rod pivoting about an axis through its center (Figure 1) . When his hands and arms are brought in and wrapped around his body to execute the spin, the hands and arms can be considered a thin-walled hollow cylinder. His hands and arms have a combined mass 7.0kg . When outstretched, they span 1.6m ; when wrapped, they form a cylinder of radius 23cm . The moment of inertia about the rotation axis of the remainder of his body is constant and equal to 0.40kg?m2.

Explanation / Answer

?2 = ?1(I1/I2)
I1 = .4 + 2*3.5*.8

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