The solid circular disk of mass m and small thickness is spinning freely on its shaft at the rate p. If the assembly is released in the vertical position at θ = 0 with θ˙ = 0, determine the horizontal components of the forces A and B exerted by the respective bearings on the horizontal shaft as the position θ = π/2 is passed. Neglect the mass of the two shafts compared with m and neglect all friction. Solve by using the appropriate moment equations.

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A B -b. 21