A room measures 2.0 m by 5.5 m by 5.0 m. The heating and air-conditioning ducts to and from the room are circular with diameter 0.23 m and all the air in the room is to be exchanged every 18 min.
(a) What is the average flow rate?
m3/s
(b) What is the necessary flow speed in the duct? (Assume that the density of the air is constant.)
m/s