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Q: The pressure from water mains located at street level may be insufficient for delivering water to the upper floors of tall buildings. In such case, water may be pumped up to a tank that feeds water to the building by gravity. For an open storage tank atop a 300-ft-tall building, determine the pressure in lbf/in/2, at the bottom of the tank when filled to a depth of 20 ft. The density of water is 62.2 lb/ft3, g= 32.0 ft/s2, and the local atmospheric pressure is 14.7 lbf/in2