Question

(38) A body of mass 0.1 kg tied to a string of length
5 m is revolved in a vertical circle such that
the maximum tension in the string is 9 N. The
minimum tension in the string is​

Answer 1

Minimum tension in the string will be 7.04 N

Explanation:

We have given mass of the body m = 0.1 kg

Length of the string l = 5 m

Maximum tension T= 9 N

We know that when a body is revolved in a circle then maximum tension occur at the bottom which is equal to

$T_{max}=F_C+mg$, here $T_{MAX}$ is maximum tension and $F_C$  is the centripetal force

So $9=F_C+0.1\times 9.8$

$F_C=8.02N$

Now minimum tension will be at top of the circle which will be equal to

$T_{MIN}=F_C-mg=8.02-0.1\times 9.8=7.04N$

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