A particle of mass ‘m’ moves with a constant speed along a circular path of radius r under the action of a force F. Its speed is given by
$\sqrt{\dfrac{Fr}{m}}$
$\sqrt{\dfrac{F}{mr}}$
$\sqrt{\dfrac{F}{r}}$
$\sqrt{Fmr}$
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A coin kept on a rotating gramophone disc just begins to slip if its centre is at a distance of 8 cm from the centre of the disc. The angular velocity of the gramophone disc is then doubled. Through what distance, the coin should be shifted towards the centre, so that the coin will just slip?