Physics homework

Question

Find the total force on the side of a rectangular tank that has dimensions of 100 feet by 100 feet filled to a height of 50 feet with a liquid SG = .73.

Answer 1

The pressure at the centroid of the wetted area of the wall multiplied by the wetted area becomes the force. Height of wetted area = 50 and half of that locates the centroid of that rectangular area. The pressure at that height = .73*62.4*25 = 1139 pounds/f² using Pascal's law and the specific weight of the fluid = .73*62.4 pounds/f³. The wetted area = 100*4*50 = 20000 f². Therefore the total force = 2277600 pounds.