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Two identical parallel discs have a comm...

Two identical parallel discs have a common axis and are located at a distance `h` from each other. The radius of each disc is equal to `q`, with `a gt gt h`. One disc is rotated with a low angular velocity `omega` relative to the other, stationary, disc. Find the moment of friction forces acting on the stationary disc if the viscosity coefficient of the gas between the disc is equal to `eta`.

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