D) During prolonged operation, the axle of the hoist at the top of the ramp and the bush surrounding the axle become very hot, due to friction. The diagram below shows

the steel axle and the bronze bush used for this application: D₁ Do At 15 °C the outside diameter of the steel axle, Do, is 78 mm and the inside diameter of the bronze bush, Di, is 78.122 mm. The coefficient of expansion of steel is 12x106 K-¹ and the coefficient of expansion of bronze 19x10-6 K-1 Determine: i) The diametral clearance between the axle and the bush at 15 °C. ii) The diametral clearance between the axle and bush at a working temperature of 75 °C. What is the diametral clearance between the axle and the bush at 15 °C? mm What is the new diameter of the Steel axle at 75 °C? mm What is the new diameter of the Bronze bush at 75 °C? mm What is the new diametral clearance between the axle and the bush at 75 °C?