The problem in physics (section 1) №051

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On the bench sits a man Zhukovsky and keeps at arm's length weights mass m = 5 kg each. The distance from each weight to the axis of the bench l = 70 cm. Bench rotates at n1 = 1 ^ -1. How will the speed of the bench, and what kind of work will make the person if he will tighten his hands, so that the distance from each axis of the weights to be reduced to l2 = 20 cm? The moment of inertia of the human and the seats (collectively) with respect to the axis J = 2,5 kg m2.

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