Fundamentholfundamenthol
JEE Main2019Physics
Q.

Two coaxial discs, having moments of inertia I1 and   , are rotating with respective angular velocities  and about their common axis. They are brought in contact with each other and thereafter they rotate with a common angular velocity. If Ef and Ei are the final and initial total energies, then (Ef – Ei) is :

  1. A

    –

  2. B

  3. C

  4. D

Solution

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