Air is expanded by an adiabatic gas turbine from 2 MPa and 500°C to 500 kPa and 100°C. If the volume flow rate at the exit is 15 m3/s, the inlet area is 0.45 m2, and the outlet area is 1.25 m2; determine the power produced by this turbine in kW. Assume that air is ideal but use a polynomial fit with coefficients defined in the back of your thermodynamics book.