1. The problem statement, all variables and given/known data Nitrogen at a pressure of 100 psia and a temperature of 300 F flows through a circular pipe with a diameter of 6 inches. The velocity profile is parabolic with V= [1-(r/3)^2] where r is the local radius in inches and V is the velocity in ft/s. Determine the mass flow rate of nitrogen through the pipe. 2. Relevant equations m = pVA 3. The attempt at a solution I suppose this would be a steady flow. Then plug in r (3 inches) into V, get V=0. And mass flow rate is 0. Which makes sense because it's a steady flow. But this answer seems to be too trivial. So I must've screwed up somewhere. Any help would be appreciated. Thanks!