Consider a person who is sitting on a friction less rotating stool as in Figure P9.43. The

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Consider a person who is sitting on a friction less rotating stool as in Figure P9.43. The person initially has his arms outstretched and is rotating with an angular speed of 5.0 rad/s. He then pulls his arms close to his body.?

(a) Estimate his final angular speed.?

(b) Estimate the kinetic energy before and after the person pulls his arms into his body.

Concerned with the magnitude of the angular momentum, not its sign.

Figure P9.43

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Consider a person who is sitting on a friction less rotating stool as in Figure P9.43. The

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Wi Wf Initial position Final position

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The angular momentum of this system remains constant because there are no external torques No sketch ...View the full answer

College Physics Reasoning and Relationships

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