3-77* A torque 7100 N m is applied to the shaft EFG, which is running at constant speed and contains gear F. Gear F transmits torque to shaft ABCD through gear C, which drives the chain sprocket at B, transmitting a force P as shown. Sprocket B, gear C, and gear F have pitch diameters of a 150, b = 250, and c 125 mm, respectively. The contact force between the gears is transmitted through the pressure angle 20°. Assuming no frictional losses and con- sidering the bearings at A, D, E, and G to be simple supports, locate the point on shaft ABCD that contains the maximum tensile bending and maximum torsional shear stresses. Combine these stresses and determine the maximum principal normal and shear stresses in the shaft. Problem 3-77* d=30 mm c-125 mm T= 100 N-m f=250 mm g125 mm e=75 mm a = 150 mm View a-a b=250 mm