Rotational kinetic energy
A bug of a known mass m stands at a distance d cm from the axis of a spinning disk (mass md and radius rd) that is rotating at fi revolutions per second. After the bug walks out to the edge of the disk and stands there, the disk rotates at ff revolutions per second. (a) Use the information above to write an expression for the rotational inertia of the disk. (b) Determine the change of kinetic energy in going from the initial to the final situation for the total bug-disk system.
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