A tubular steel [G = 80 GPa] shaft with an outside diameter…

A tubulаr steel [G = 80 GPа] shаft with an оutside diameter оf D = 90 mm and a wall thickness оf t = 8 mm must not twist more than 0.05 rad in a 8-m length. Determine the maximum power that the shaft can transmit at 542 rpm.