2. A solid steel shaft of 500 mm long between bearings A and C and carrying a cast iron pulley at B which is at 300 mm from the bearing A. The pulley is directly coupled to a 5 kW motor running at 750 rpm. The motor is located left side of the bearing A. The cast iron pulley is of 250 mm in diameter and weighing 100 N and is driving a machine shaft running below it. The belt from pulley to the machine is inclined 60 to the vertical. Determine the appropriate diameter of the shaft, assuming moderate shock conditions, the friction factor between the pulley and the belt as 0.3, factor of safety 4.0