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A dumbbell is made out of two 4.5 kg masses connected by a rod of negligible...

A dumbbell is made out of two 4.5 kg masses connected by a rod of negligible mass which is 30 cm long. How much work, in joules, is required to take the dumbbell from rest to an angular speed of 5.0 rad/s? Treat the masses as particles: rotation is about the center of mass.

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