what is the upward force on the bottom of an empty underground storage tank caused by a groundwater depth of 5 feet above the tank bottom? the tank is 8 feet wide and 16 feet long.

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- Oct 26th 2008, 03:39 PM #1

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- Oct 26th 2008, 04:32 PM #2

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This is a Physics problem, I must say. According to the Archimedes Principle, any body immersed in some fluid receives a upward force equal to the weight of the moved fluid. See Buoyancy.

Considering the tank to be prismal, it moved a voume of water of $\displaystyle 5 x 8 x 16 = 640 ft^3 \simeq 18 m^3 = 18.000 l$ of water. As one liter of water weights aproximately one kg,

$\displaystyle F = 18.000 kgf$

- Oct 26th 2008, 04:51 PM #3

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