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Q.

A body of mass 2 kg attached at one end of light string is rotated along a vertical circle of radius 2 m. If the string can withstand a maximum tension of 140.6 N, the maximum speed with which the stone can be rotated is

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a

22 m/s

b

44 m/s

c

33 m/s

d

11 m/s

answer is D.

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Detailed Solution

Tmax=mv2r+g

140.6=2v22+9.8 140.6-19.6=v2 v=11m/s

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