A Pitot tube is used to measure the velocity of an airstream at 20°C and 1.0 atm. If the velocity is 2.5 m/s, what is the dynamic pressure in newtons per square meter? What is the uncertainty of the velocity measurement if the dynamic pressure is measured with a manometer having an uncertainty of 5 Pa?

Acircular pipe of 30mm outside diameter is placed in an airstream at 30 c and latm pressure. the air moves in cross flow over the pipe at 20 m/s, while the outer surface of the pipe is maintained at 110 c. what is the drag force exerted on the pipe per unit length? what is the rate of heat transfer from the pipe per unit length?