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Conceptual discussions on mechanics problems.

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Need help with the following physics problems:

1. About medio-lateral axes, the moment of inertia of a person's upper arm (shoulder-elbow segment) was found to be 0.06 kg.m^2 for rotation about the shoulder joint, and 0.08 kg.m^2 for rotation about the elbow joint. Why are these numbers different?

2. A diver's body, while in the air, is rotating about the medio-lateral axis through its center of mass. There is no external torque acting on the body. What can you say about the body's angular momentum and about its angular velocity?

3. Why do the legs sink when a person is floating in water?

4. Why do distance runners in a race often try to get behind another runner?

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Solution Summary

This solution provides a conceptual discussion on mechanics problems.

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