The outstretched handsand arms of a figure skater preparingfor a spin can be considered aslender rod pivoting about an axisthrough its center (Fig. ).When the skater’s hands and armsare brought in and wrapped aroundhis body to execute the spin, thehands and arms can be considereda thin-walled, hollow cylinder. Hishands and arms have a combinedmass of 8.0 kg. When outstretched, they span 1.8 m; when wrapped,they form a cylinder of radius 25 cm. The moment of inertia aboutthe rotation axis of the remainder of his body is constant and equal to0.40 kg . m2. If his original angular speed is 0.40 rev/s, what is his finalangular speed?

The outstretched handsand arms of a figure skater preparingfor a spin can be considered aslender rod pivoting about an axisthrough its center (Fig. ).When the skater’s hands and armsare brought in and wrapped aroundhis body to execute the spin, thehands and arms can be considereda thin-walled, hollow cylinder. Hishands and arms have a combinedmass of 8.0 kg. When outstretched, they span 1.8 m; when wrapped,they form a cylinder of radius 25 cm. The moment of inertia aboutthe rotation axis of the remainder of his body is constant and equal to0.40 kg . m2. If his original angular speed is 0.40 rev/s, what is his finalangular speed?

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