5. A transmission shaft is supported between two bearings, with distance 750 mm. Power is supplied to the shaft and transmitted to belt pulley, 450 mm diameter, which is located at a distance of 200 mm to the right of left-hand bearing. The weight of the pulley is 300 N and the ratio of belt tension of tight and slack sides is 2:1. The belt tensions act in vertically downward direction. The shaft is made of steel Fet 300 (Syt = 300 N/mm) and the factor of safety is 3. Determine the shaft diameter, if it transmits 12.5 kW power at 300 rpm to the pulley. Assume (Sxy = 0.5 Sye). (14 marks)