The motor M is connected to the speed reducer C by the tubular shaft and coupling. If the...

The motor M is connected to the speed reducer C by the tubular shaft and coupling. If the motor supplies 20 hp and rotates the shaft at a rate of 600 rpm, determine the minimum inner and outer diameters diand d0 of the shaft if did0 = 0.75. The shaft is made from a material having an allowable shear stress of Tallow= 12 ksi.