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Question

A stone of mass m at the end of a string of length I is whirled in a vertical circle at a constant speed. The tension is the string will be maximum when the stone is


A

At the top of the circle

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B

Half way down from the top

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C

Quarter way down from the top

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D

At the bottom of the circle

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Solution

The correct option is D

At the bottom of the circle


Considering dynamic equilibrium

T1=mg+mV2r
T2=mV2rmg

T1>T2
Maximum tension will be at the bottom of the circle


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