A room has a volume of 120 m3. An air-conditioning system is to replace the air in this room every twenty minutes, using ducts that have a square cross section. Assuming that air can be treated as an incompressible fluid, find the length of a side of the square if the air speed within the ducts is: a) 3.0 m/s and b) 5.0 m/s.

Labor, worker or construction laborer are the skilled workers employed in the construction site who performs several works which demand physical strength. The laborer's task is very challenging and often leads to fatigue and exhaustion. Depending on the …