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Two homogeneous discs each of radius R = 0.3 m are located one above the other so that their axes coincide. The upper disk is stationary, and the lower one rotates with an angular velocity of 126 rad / s. The distance between the planes of the disks L = 5mm. Dynamic viscosity of air 17mkPa · s. Find the moment of friction forces M acting on the upper disk. Neglect the edge effects.
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