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    Angular Velocity and Rotational Energy

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    A disk of radius .3 meters and mass of .5kg is held over another disk of radius .5 meters and mass 1 kg which is rotating in a horizontal plane at a rate of 15.92 rev/sec. The top disk is released and drops onto the bottom disk (centers align).

    a) What is the final angular velocity (in rev/sec) of the two disks?
    b) What was the change in rotational energy of the two-disk system?

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    Solution Preview

    See the attached file.

    Question a)

    For the system, the total energy did not change, ...

    Solution Summary

    The solution provides step-by-step calculation for final angular velocity and rotational energy in a two-disk system.