One end of a spa is a vertical rectangular wall 12.0 ft wide. What is the force exerted on this wall by the water if it is 2.50 ft deep? A rectangular sea aquarium observation window is 10.0 ft wide and 5.00 ft high. What is the force on this window if the upper edge is 4.00 ft below the surface of the water? The density of seawater is 64.0 Ib/ft3.