12.3 Air enters a turbine in steady flow at 0 5 kg s with negligible velocity. Inlet conditions are 1300 C and 2.0 MPa absolute. The air is expanded through the turbine to atmospheric pressure. If the actual temperature and velocity at the turbine exit are 500 C and 200 m s, determine the power produced by the turbine. Label state points on a Ts diagram for this process.