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NEET UG PHYSICS MCQ: SYSTEM OF PARTICLES

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Two discs of same moment of inertia rotating about
their regular axis passing through centre and
perpendicular to the plane of disc with angular
velocity 2 rad/s and 4 rad/s. They are brought into
contact face to face coinciding the axis of rotation.
The expression for loss of energy during this procss
is:

View answer and explanation

Correct option: A

I

Option D (All of the above) is correct because pulling the weights inwards decreases the moment of inertia, increasing angular velocity and kinetic energy while conserving angular momentum.

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