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Friction and Vertical Circular Motion Problems

A boy is swin...

Question

A boy is swinging in a swing. If he stands the time period will

A

First decreases, then increase

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B

Decrease

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C

Increase

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D

Remain same

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Solution

The correct option is B Decrease
As the child stand up the effective length of pendulum decreases due to the reason that center of gravity rises up.
According to $T = 2 π \sqrt{(\frac{l}{g})}$
Thus, the time peroid decreases

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