(9) Warm air is flowing along an uninsulated duct of area A=0.4 m?. The inflow velocity is U1=8 m/sand the air density is R1=1.1 kg/m³. The air cools as it

travels along the duct such that, at the outlet, the density of the air is R2=1.23 kg/m³. Calculate the outflow velocity. How would your answer change it the duct area was A=0.2 m² along its entire length?

Fig: 1

Fig: 2