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AP EAMCET202017 Sep 2020Evening ShiftPhysicsMotion in Two DimensionsActual

Find the centripetal force acting on a coin weighing (0.1 ~kg ) placed (0.1 ~m ) from the centre on a gramophone disc rotating at (600 rpm ).

Options

  1. A(4 ^2 ~N )
  2. B(40 ^2 ~N )
  3. C( ^2 4 ~N )
  4. D( 4 ^2 ~N )

Correct answer

A. (4 ^2 ~N )

Step-by-step solution

Weight of coin, (m=0.1 ~kg ) (r=0.1 ~m ) Angular frequency, (f=600 rpm = 600 60 rps =10 rps =10 ~Hz ) ( ) Angular velocity, ( =2 f=2 10=20 rad / s ) ( ) Centripetal force, ( aligned F & =m r ^2=0.1 0.1 (20 )^2 & =0.01 400 ^2=4 ^2 ~N aligned )

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