An assemble consisting of two cylindrical portions AB and BC is fixed at the rigid wall at A. Section AB is made of steel (Es = 200 GPa, αs = 12 × 10−6 /°C) and section BC is made of aluminum (Eal = 73 GPa, αal = 23 × 10−6 /°C). If the gap between C and the rigid wall at D is 0.15 mm when the temperature is 10 °C, determine the average normal stress in section BC when the temperature rises to 50°C

A2-m rigid tank initially contains saturated water vapor at 100 kpa. the tank is connected to a supply line through a valve. steam is flowing in the supply line at 600 kpa and 300 c. the valve is opened, and steam is allowed to enter the tank until the pressure in the tank reaches the line pressure, at which point the valve is closed. a thermometer placed in the tank indicates that the temperature at the final state is 200°c. determine (a) the mass of steam that has entered the tank (b) the amount of heat transfer.