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Q.

A point mass 'm' is moved in a vertical circle of radius 'r' with the help of a string. The velocity of the mass is 7gr at the lowest point. The tension in the string at the lowest point is

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a

7 mg

b

1 mg

c

8 mg

d

6 mg

answer is D.

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Detailed Solution

Question Image

T−mg=mv2rT−mg=m(7gr)rT=8mg

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A point mass 'm' is moved in a vertical circle of radius 'r' with the help of a string. The velocity of the mass is 7gr at the lowest point. The tension in the string at the lowest point is