A bob of mass 10m is suspended through an ine | vedclass

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Question

(C) Let the impulsive tension in the string be $J$. The impulsive force exerted by each particle on the bob along the string is $m u \cos 60^{\circ}$.

Vedclass · Accepted Answer

$mu$

Vedclass · Answer

(C) Let the impulsive tension in the string be $J$. The impulsive force exerted by each particle on the bob along the string is $m u \cos 60^{\circ}$.Since there are two such particles striking simultaneously from opposite sides, the total impulsive force acting on the bob along the string is $2 	imes (m u \cos 60^{\circ})$.Using the impulse-momentum theorem along the vertical direction (the direction of the string):$J - 2mu \cos 60^{\circ} = 0$ (since the bob is constrained by the string and cannot move vertically).$J = 2mu 	imes \frac{1}{2} = mu$.Thus, the impulsive tension in the string is $mu$.

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