4.12. A rigid container is initially evacuated. Its valve is then opened and air flows in until the pressure is 1atm. Assume that air is an ideal gas and that heat transfer is negligible. During the filling process the kinetic energy of the inflowing gas is substantial, but at the end of the process the gas in the container has all come to rest. Write the energy balance for this process, and show the relation between the final temperature and the temperature of the surrounding air