A solid 3-in.-diameter bronze [G = 6,000 ksi] shaft is 7 ft long. The allowable shear stress in the shaft is 8 ksi, and the angle of twist must not exceed 0.03 rad. Determine the maximum horsepower...

A solid 3-in.-diameter bronze [G = 6,000 ksi] shaft is 7 ft long. The allowable shear stress in the shaft is 8 ksi, and the angle of twist must not exceed 0.03 rad. Determine the maximum horsepower that this shaft can deliver

(a) when rotating at 150 rpm.

(b) when rotating at 540 rpm.