A disc has mass 'M' and radius 'R'. How ...

A disc has mass 'M' and radius 'R'. How much tangential force should be applied to the rim of the disc, so as to rotate with angular velocity `'omega'` in time 't' ?

`(MR omega)/(4t)`

`(MR omega)/(2t)`

`(MR omega)/(t)`

`MR omega t`

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