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Physics-

General

Easy

Question

A coin is placed on a gramophone record rotating at a speed of 45 rpm. It flies away when the rotational speed is 50 rpm. If two such coins are placed over the other on the same record, both of them will fly away when rotational speed is

100 rpm
25 rpm
12.5 rpm
50 rpm

The correct answer is: 50 rpm

A coin files off when centrifugal force just exceeds the force of friction $i e comma$
$m r omega to the power of 2 end exponent greater or equal than mu m g$
or $omega greater or equal than fraction numerator square root of mu g end root over denominator r end fraction$
Thus $omega$ does not depend upon mass and will remain the same

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