A particle of mass m is executing uniform circular motion on a path of radius r. If p is the magnitude of its linear momentum, then, the radial force acting on the particle is,
pmr
$\dfrac{rm}{p}$
$\dfrac{mp^2}{r}$
$\dfrac{p^2}{rm}$
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A wheel of diameter 20 cm is rotating at 600 rpm. The linear velocity of particle at its rim is