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Question

When a body is whirled in a circle, the work done by centripetal force on it is

A
positive
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B
negative
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C
zero
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D
Infinity
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Solution

The correct option is C zero
This would mean that the force is always directed perpendicular to the direction that the object is being displaced. The angle Theta in the above equation is 90 degrees and the cosine of 90 degrees is 0. Thus, the work done by the centripetal force in the case of uniform circular motion is 0 Joules.

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