Steam is usually accelerated in the nozzle of a turbine before it strikes the turbine blades. Steam enters an adiabatic nozzle at 7 MPa and 500°C with a velocity of 70 m/s and exits at 5 MPa and 450°C. Assuming the surroundings to be at 25°C, determine
(a) The exit velocity of the steam,
(b) The isentropic efficiency, and
(c) The exergy destroyed within the nozzle.