Question: Air flows through a duct with a constant cross-sectional area. The pressure, temperature, and Mach number at the inlet to the duct are 180 kPa, 30°C, and 0.25, respectively. If the Mach number at the exit of the duct has risen to 0.75 as a result of friction, determine the pressure, temperature, and velocity at the exit. Assume that the flow is adiabatic.