Problem \#3: Air at 122F and 14.7 psia flows in a rectangular duct 1ft3ft at a rate of 150ft3/s. The duct is horizontal and 1000ft long and is made of galvanized iron. Estimate the pressure loss due to friction in this duct. Viscosity of air is 4.1107lbs/ft2. At the end of your calculations verify whether air can be considered incompressible or not. Problem \#3: Air at 122F and 14.7 psia flows in a rectangular duct 1ft3ft at a rate of 150ft3/s. The duct is horizontal and 1000ft long and is made of galvanized iron. Estimate the pressure loss due to friction in this duct. Viscosity of air is 4.1107lbs/ft2. At the end of your calculations verify whether air can be considered incompressible or not