An oil storage tank has a flat, horizontal, circular roof 45 m in diameter. The atmospheric pressure is at 760 mm Hg. What force does the atmosphere exert on the roof? Suppose this tank has a vent to the atmosphere to allow air to move in and out as the tank is filled. This vent is plugged by snow because of a blizzard while the oil is being pumped out of the tank, and the gauge pressure in the tank falls to 1 psig. What is the net force on the roof of the tank?