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At any angular speed, a certain uniform solid cylinder of diameter D has twice as much...

At any angular speed, a certain uniform solid cylinder of diameter D has twice as much rotational kinetic energy as a certain uniform thin-walled hollow cylinder of the same diameter when both are spinning about an axis through their centers. If the mass of the hollow cylinder is m, the mass of the solid cylinder is

A) 1/4 m. B) 1/2 m. C) m. D) 4 m. E) 8 m.

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