Question: You need to design an industrial turntable that is 60.0 cm in diameter and bas a kinetic energy of 0.250 J when turning at 45.0

You need to design an industrial turntable that is 60.0 cm in diameter and bas a kinetic energy of 0.250 J when turning at 45.0 rpm {rev/min}.
(a) What must be the moment of inertia of the turntable about the rotation axis? (b) If your workshop makes this turntable in the shape of a uniform solid disk, what must be its mass?

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