The floor of a cylindrical water tank was distorted into 7 in. bulges because of the settling of improperly stabilized soil under the tank floor. However, several consulting engineers restored the damaged tank to use by placing plastic skirts around the bottom of the tank wall and devising an air flotation system to move it to an adjacent location. The tank was 30.5 m in diameter and 13.1 m deep. The top, bottom, and sides of the tank were made of 9.35-mm-thick welded steel sheets. The density of the steel is 7.86 g/cm3.
a. What was the gauge pressure in kilopascals of the water at the bottom of the tank when it was completely full of water?
b. What would the air pressure have to be in kilopascals beneath the empty tank in order to just raise it up for movement?
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