A student wishes to find the velocity of air flowing through a pipe. He has a pressure gauge which displays only the dynamic pressure. The pressure gauge reads 0.018 mm Hg. Assume density of air to be 1.225 kg/m3, find the velocity V of air ( Hg = 13600 kg/m3).

A student wishes to find the velocity of air flowing through a pipe. H

1.	A student wishes to find the velocity of air flowing through a pipe. He has a pressure gauge which displays only the dynamic pressure. The pressure gauge reads 0.018 mm Hg. Assume density of air to be 1.225 kg/m3, find the velocity V of air ( Hg = 13600 kg/m3).
A.	4 m/s
B.	2 m/s
C.	20 m/s
D.	40 m/s
Answer» C. 20 m/s