Question

a coin placed on a gramophone record rotating at 33rpm flies off d record , if it is placed at a dist. of more than 16cmfrom d axis of rotation . If d record is revolving at 66rpm , the coin will fly off if it is placed a distance not less than ?

ans=4cm

Joshi sir comment

coin will fly off, if it will gain the required centrifugal

so apply mrω2 = mRW2

 

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