A physics student is sitting on a rotating platform. He is holding a heavy weigh

Question

A physics student is sitting on a rotating platform. He is holding a heavy weight in each of his outstretched hands. At request of his physics instructor(!) he carries out various manoeuvres to try to change his angular velocity. Which of the following scenarios are described correctly?
Select True or False.
1?Starting with angular velocity ?gw, he raises his feet, and points them outwards from the chair as far as he can. His angular velocity reverses.
2?A friend throws a third weight so that the student catches it in one of his outstretched hands. No matter what the direction of the throw, the student's angular velocity does not change.
3?Starting with angular velocity ?gw, he transfers both the weights to one outstretched hand. He then stretches his other hand back out to its original position. His angular velocity (after the manouvre is complete) has decreased.
4?Starting with angular velocity ?gw, he transfers both the weights to one outstretched hand. His angular velocity (after the manoeuvre is complete) has reversed.
5?Starting with angular velocity ?gw, he brings the weights in to his chest. His angular velocity decreases.
6?Starting with angular velocity ?gw, he raises his feet, and points them outwards from the chair as far as he can. His angular velocity increases.
7?A friend throws a third weight so that the student catches it in one of his outstretched hands. No matter what the direction of the throw, the student's angular velocity reverses.
8?Starting with angular velocity ?gw, he drops the weights. His angular velocity decreases.
9?Starting at rest, he drops the weights. His angular velocity decreases.
10?Starting at rest, he brings the weights in to his chest. His angular velocity does not change.

Explanation / Answer

3)

Starting with angular velocity ?gw, he transfers both the weights to one outstretched hand. He then stretches his other hand back out to its original position. His angular velocity (after the manouvre is complete) has decreased.

TRUE.

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