Rotational MotionHard

Question

A uniform rod of mass M and length L lies radially on a disc rotating with angular speed ω in a horizontal plane about its axis. The rod does not slip on the disc and the centre of the rod is at a distance R from the centre of the disc. Then the kinetic energy of the rod is -
                                                   

Options

A.
B.mω2R2
C.mω2L2
D.None of these

Solution

As rod does not slip on the disc, so the kinetic energy of the rod is
=
I - MI of rod about axis passing through centre of disc & perpendicular to the plane.

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