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  4. A stone is attached to one end of a string and rotated in a vertical circle. If string breaks at the position of maximum tension, it will break at <img class=img-fluid question-image alt=image src=https://cdn.tardigrade.in/img/question/physics/0628535beb6ea8b6822ff1a8f7ac5c2a-.png />

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Q. A stone is attached to one end of a string and rotated in a vertical circle. If string breaks at the position of maximum tension, it will break at
image

Work, Energy and Power

Solution:

The body describing a vertical circle
image
$\therefore T-mg \,\cos \theta=\frac{m v^{2}}{R}$
$\Rightarrow T = mg \cos \theta+\frac{ mv ^{2}}{ R }$
Tension is maximum when $\cos \theta=1$ and velocity is maximum. Both conditions are satisfied at $\theta=0^{\circ}$, i.e. at lowest point $B$.