The pressure in a pipeline that transports helium gas at a rate of 7 lbm/s is maintained a...

The pressure in a pipeline that transports helium gas at a rate of 7 lbm/s is maintained at 14.5 psia by venting helium to the atmosphere through a 0.4-in internal diameter tube that extends 30 ft into the air. Assuming both the helium and the atmospheric air to be at 80°F, determine (a) the mass flow rate of helium lost to the atmosphere through the tube, (b) the mass flow rate of air that infiltrates into the pipeline, and (c) the flow velocity at the bottom of the tube where it is attached to the pipeline that will be measured by an anemometer in steady operation.