a small round object is tested in a 0.75-m diameter wind tunnel. the pressure is uniform across sections 1 and 2 . the upstream pressure is 30 mm h2o (gage), the downstream pressure is 15 mm h2o (gage), and the mean air speed is 12.5 m/s. the velocity profile at section 2 is linear; it varies from zero at the tunnel centerline to a maximum at the tunnel wall. calculate (a) the mass flow rate in the wind tunnel, (b) the maximum velocity at section 2 , and (c) the drag of the object and its supporting vane. neglect viscous resistance at the tunnel wall.
