A solid steel shaft 150 mm outer diameter and 100 internal diameter with length 700 mm transmits 30 kW at 180 rev/min. Give that for steel material G = 80 GN/ m2, calculate: The maximum shear stress induced. [4 Marks] The angle of twist in degrees, [3 Marks] iii. The shear stress at radius of 20 mm. [3 Marks]