In Figure 9.24a an ice skater is spinning with both arms
Chapter 9, Problem 9.91(choose chapter or problem)
In Figure 9.24a an ice skater is spinning with both arms and a leg outstretched. In Figure 9.24b she pulls her arms and leg inward. As a result of this maneuver, her angular velocity increases dramatically. Why? Neglect any air resistance and assume that friction between her skates and the ice is negligible. (a) A net external torque acts on the skater, causing to increase. (b) No net external torque acts on her; she is simply obeying the conservation of angular momentum. (c) Due to the movements of her arms and legs, a net internal torque acts on the skater, causing her angular momentum and to increase.
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