Air flows steadily through a long insulated duct with a constant cross sectional area of 100 cm2. At the inlet, the conditions are 300 kPa, 300 K and 10 m/s. At the exit, the pressure drops to 50 kPa due to frictional losses in the duct. Determine
(a) The mass flow rate of air,
(b) The exit temperature in K.
(c) The exit velocity in m/s. Use the PG model for air.
(d) Determine the entropy generated due to thermodynamic friction in the duct.