Air enters a 12 cm diameter adiabatic duct at Ma1 = 0.4, T1 = 550 K, and P_{1} = 200 kPa. The average friction factor for the duct is estimated to be 0.021. If the Mach number at the duct exit is 0.8, determine the duct length.

Air enters a 12 cm diameter adiabatic duct at Ma1 = 0.4, T1 = 550 K, and P_{1} = 200 kPa. The average friction factor for the duct is estimated to be 0.021. If the Mach number at the duct exit is 0.8, determine the duct length.


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