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Second Law of Motion

A man standin...

Question

A man standing on a table rotating about the central axis pulls his hands holding the dumb bells towards chest. How the angular velocity will change?

A

increase or decrease depending on the magnitude of angular velocity of the wheel

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B

decrease

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C

increase

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D

remains same

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Solution

The correct option is C
increase

When the man pulls his hands towards chest, the moment of inertia will decrease and due to conservation of angular momentum, angular velocity will increase.

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