An ice skater is spinning about a vertical axis with arms fully extended. If the arms are pulled in closer to the body, in which of the following ways are the angular momentum and kinetic energy of the skater affected?
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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. 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 of 9.0 kg. When outstretched, they span 1.7 m; when wrapped, they form a cylinder of radius 26 cm. The moment of inertia about the rotation axis of the remainder of his body is constant and equal to .
if his original angular speed is 0.30 rev/s, what is his final angular speed?
The outstretched hands and arms of a skater(As shown in the figure) preparing for a spin can be considered a slender rod pivoting about an axis through its center. 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 of 9.0 kg. When outstretched, they span 1.7 m; when wrapped, they form a cylinder of radius 26 cm. The moment of inertia about the rotation axis of the remainder of his body is constant and equal to 0.40 .
If his original angular speed is 0.50 rev/s, what is his final angular speed?
