A person standing in the center of a circular platform with a radius of R = 3 m and a moment of inertia J = 10 kg * m2, rotating at a frequency of 1 s-1, moved to the edge of the platform and pressed the brake pedal, pressing the wooden brake shoe against the wooden fence of the platform with a force F = 20 N. Determine the braking time. The mass of a person is m = 80 kg, his moment of inertia is calculated as for a material point. Friction coefficient 0.1.
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