Air is flowing steadily through a horizontal tube at a constant temperature of 328C and a mass flow rate of 1 kg/s. At one point upstream where the tube diameter is 50 mm, the pressure is 345 kPa. At...

Air is flowing steadily through a horizontal tube at a constant temperature of 328C and a mass flow rate of 1 kg/s. At one point upstream where the tube diameter is 50 mm, the pressure is 345 kPa. At another point downstream the diameter is 75 mm and the pressure is 359 kPa. What is the value of the friction loss (ef) between these two points? [cp ¼ 1005 J/(kg K).]