Question: A record is dropped vertically onto a freely rotating ( undriven ) turntable. Frictional forces act to bring the record and turntable to a common

A record is dropped vertically onto a freely rotating (undriven) turntable. Frictional forces act to bring the record and turntable to a common angular speed. If the rotational inertia of the record is 0.54 times that of the turntable, what percentage of the initial kinetic energy is lost?

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