42. On the bench Zhukovsky man sitting and holding in h

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42. On the bench Zhukovsky man sitting and holding in his outstretched hands weights mass m = 10 kg each. The distance from each weight from the axis of rotation of the bench l1 = 50 cm. Bench rotates at n1 = 1,0 s-1. How will the speed of the bench, and what kind of work will produce A man, if he will tighten his hands, so that the distance from each axis of the weights to be reduced to l2 = 20 cm. The total moment of inertia with respect to human rights and the bench rotation axis J = 2,5 kg ∙ m2. The axis of rotation passes through the center of mass of the person and of the bench.

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Detailed solution. Decorated in Microsoft Word 2003. (Target decided to use formula editor)


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