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

decreased by a factor of 2

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decreased by a factor of 4

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increased by a factor of 2

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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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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

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

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

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.