5–31. The solid steel shaft AC has a diameter of 25 mm
and is supported by smooth bearings at D and E. It is coupled
to a motor at C, which delivers 3 kW of power to the shaft
while it is turning at 50 rev>s. If gears A and B remove 1 kW
and 2 kW, respectively, determine the maximum shear stress
developed in the shaft within regions AB and BC. The shaft is
free to turn in its support bearings D and E.