In: Mechanical Engineering
A 20 kg block of iron and a 50 kg block of lead are sealed together in a tank with 5 kg of air. Initially the iron, lead, and air are at 200°C, 150°C, and 20°C, respectively. The air is initially at 100 kPa. After some time, the final system reaches thermal equilibrium and the air pressure inside the tank is 141 kPa. How much heat transfer occurred between the tank and the surrounding 20°C air? How much total entropy has been generated? There is air inside and outside of the tank.