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  4. A ball of mass m is tied up with string and rotated along a horizontal circle of radius r. At an instant, its velocity is v, and tension in string is T, the force required for circular motion is

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Q. A ball of mass $m$ is tied up with string and rotated along a horizontal circle of radius $r$. At an instant, its velocity is $v$, and tension in string is $T$, the force required for circular motion is

AIIMSAIIMS 2013Laws of Motion

Solution:

From figure,
$\therefore T \sin \theta = \frac{mv^{2}}{r}$

Solution Image