A pitot static tube is used to measure the velocity of air in a duct. The water manometer shows a reading of 8 cm. The static pressure in the duct is 9 kN/m2 and the air temperature is 320 K. The...

A pitot static tube is used to measure the velocity of air in a duct. The water manometer shows a reading of 8 cm. The static pressure in the duct is 9 kN/m2 and the air temperature is 320 K. The local barometer reads 740 mm of mercury. Calculate the air velocity if Cv = 0.98. Assume the gas constant for air as 287 J/kg K.