A door 1 m wide and 1.5 m high is located in a plane vertical wall of a water tank. The door is hinged along the upper edge, which is 1 m below the water surface. Atmospheric pressure acts on the outer surface of the door and at the water surface. Determine the magnitude and line of action of the total resultant force from all fluids acting on the door. Place the origin of your coordinate system 1 m below the free surface.