A sphere of mass $m$ is tied to end of a string of length $l$ and rotated through the other end along a horizontal circular path with speed $v$. The work done in full horizontal circle is
A sphere of mass $m$ is tied to end of a string of length $l$ and rotated through the other end along a horizontal circular path with speed $v$. The work done in full horizontal circle is
$0$
$\left( {\frac{{m{v^2}}}{l}} \right)\,.\,2\pi l$
$mg\,.\,2\pi l$
$\left( {\frac{{m{v^2}}}{l}} \right)\,.\,(l)$
A sphere of mass $m$ is tied to end of a string of length $l$ and rotated through the other end along a horizontal circular path with speed $v$. The work done in full horizontal circle is
Work done by centripetal force in uniform circular motion is always equal to zero.