Concept explainers
The reason why the hips and legs of a shortstop rotate in the opposite direction as compared to his upper body when he throws a ball quickly
Answer to Problem 21Q
Solution:
The
Explanation of Solution
The reason for this is the principle of conservation of angular momentum. The shortstop’s body has a certain angular momentum to begin with. When the upper part of his body rotates in a particular direction while throwing the ball, the angular momentum of his body tends to increase. To balance it, the lower part of the body tends to rotate in the opposite direction, thus cancelling out the change in the
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