4.43 Air expands through a turbine from 10 bar, 900 K to 1 bar, 500 K. The inlet velocity is small compared to the exit veloc- ity of 100 m/s. The turbine operates at steady state and devel- ops a power output of 3200 kW. Heat transfer between the tur- bine and its surroundings and potential energy effects are negligible. Calculate the mass flow rate of air, in kg/s, and the exit area, in m².