Make a free-body diagram for the unit consisting of shaft AB and disk C (see Fig. 1), and...

Make a free-body diagram for the unit consisting of shaft AB and disk C (see Fig. 1), and show all forces and torques necessary for equilibrium. Coefficient of friction μ = 0.3. Sufficient force is exerted between the disks to develop the full coefficient of friction. The entire torque is carried by the torque reaction at A. Force reactions are applied at the bearings as shown.

Figure 1