A body of mass, m, is rotated in a vertical circle of radius, R, by means of a light string. If the velocity of body is √5gR at the lowest point of vertical circle, then tension in the string is:
3mg
2mg
4mg
6mg
A
2mg
B
3mg
C
4mg
D
6mg
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Solution
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At lowest point, tension acts in upward direction, weight, mg, in downward direction. T−mg provides necessary centripetal force. T−mg=mν2R ⇒T=6mg
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