A block of mass $m$ at the end of a string is whirled round in a vertical circle of radius $R$. The critical speed of the block at the top of its swing below which the string would slacken before the block reaches the top is
A block of mass $m$ at the end of a string is whirled round in a vertical circle of radius $R$. The critical speed of the block at the top of its swing below which the string would slacken before the block reaches the top is
$Rg$
${(Rg)^2}$
$R/g$
$\sqrt {Rg} $
A block of mass $m$ at the end of a string is whirled round in a vertical circle of radius $R$. The critical speed of the block at the top of its swing below which the string would slacken before the block reaches the top is
At highest point $\frac{{m{v^2}}}{R} = mg$
$⇒$ $v = \sqrt {gR} $
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