A hollow shaft with diameter ratio 3 / 5 is required to transmit 450 kW at
120 rpm with a uniform twisting moment The shearing stress in the shaft
must not exceed 60 N/mm2 and the twist in a length of 2.5 m must not
exceed 1o. Calculate the external diameter of the shaft satisfying these
conditions. Take the modulus of rigidity is 8×104 N/mm2.
