4. Air enters a well - insulated horizontal pipe having a diameter of 2 cm with inlet temperature of47°C , and inlet pressure of 500 KPa. The exit pressure and temperature are 100 KPa and 300 K respectively.Applying the ideal gas model, determine at steady state: (20 points) a) The inlet and exit velocities in m/s. b) The mass flow rate in Kg/s.

Fig: 1

Fig: 2

Fig: 3