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Question

A stone of mass 0.5 kg is attached to a string of length 2 m and is whirled in a horizontal circle. If the string can with stand a tension of 9N, the maximum velocity with which the stone can be whirled is:

A
6 ms1
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B
8 ms1
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C
4 ms1
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D
12 ms1
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Solution

The correct option is A 6 ms1

Given,

Mass,M=0.5kg

Radius,R=2m

Tension,T=9N

Centrifugal force = tension in string

MV2r=T

V=TrM=9×20.5=6ms1

Maximum velocity of stone is 6ms1


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