Consider a person who is sitting on a friction less rotating stool as in Figure P9.43. The
Question:
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
?
Wi Wf Initial position Final position
Step by Step Answer:
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
ISBN: 978-0840058195
2nd edition
Authors: Nicholas Giordano
Related Video
Angular movements are produced when the angle between the bones of joint changes. There are several different types of angular movements, including flexion, extension, hyperextension, abduction, adduction, and circumduction. Flexion, or bending, occurs when the angle between the bones decreases. Moving the forearm upward at the elbow or moving the wrist to move the hand toward the forearm are examples of flexion. The extension is the opposite of flexion in that the angle between the bones of a joint increase.
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