2. One of two hollow shafts of an ocean liner is 125 ft. long, and its outer and inner diameter are

16 in. and 8 in. respectively. The shaft is made of steel for which Tall-8500 psi and G = 11.2 x

106 psi. Knowing that the maximum speed of rotation of the shaft is 165 rpm, determine (a) the

maximum power that can be transmitted by the one shaft to its propeller, (b) the corresponding

angle of twist of the shaft.