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Question

A mass m rotates in a vertical circle, of radius R and has a circular speed vc at the top, . If the radius of the circle is increased by a factor of 4, circular speed at the top will be.

A
decreased by a factor of 2
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B
decreased by a factor of 4
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C
increased by a factor of 2
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D
increased by a factor of 4
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Solution

The correct option is A decreased by a factor of 2
Circular speed at the top will be decreased by a factor of 2.
Hence,
option (A) is correct answer.

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