The horizontal platform in the form of a circular disc of a homogeneous mass of 80 kg and a radius of 1m rotates at 20ob / min. In the center of the platform stands a man and holding a kettlebell outstretched hands. With what frequency the platform will rotate, if a person, his arms, reduce its moment of inertia of 2,94kg to 0,98kg · m2 · m2?

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