Q.
The maximum and minimum tensions in the string used to rotate a body in a vertical circle are in the ratio 19:1. The ratio of maximum to minimum speeds of the body
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a
2:1
b
19:1
c
4;14
d
5:1
answer is A.
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Detailed Solution
we know Tmax-Tmin=6mg given TmaxTmin=19 Tmax=19Tmin substituting 18Tmin=6mg Tmin=mg3 mv22l-mg=mg3 ; mv22l=4mg3 ⇒1 then Tmax=19mg 3 =mv12l+mg mv12l=16mg3⇒2 dividing 2 by 1 v1v2=21
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