Air with a velocity of 40 m/s enters an adiabatic turbine through a 4-cm-diameter pipe at 2

Question:

Air with a velocity of 40 m/s enters an adiabatic turbine through a 4-cm-diameter pipe at 2 MPa and 400°C and expands to the exit maintained at 100 kPa. Determine the power produced if
a) The air exits at 30°C
b) An adiabatic, quasi-equilibrium process is experienced by the air.