9 warm air is flowing along an uninsulated duct of area a04 m the infl
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(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?