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Homework Statement
A pyramid weighing 4000 lb has a base 6ft square and an altitude of 4ft. The base covers an opening in the floor of a tank in which there is water 4 ft deep. Underneath the floor of the tank and on the water surface there is air at atmospheric pressure. What vertical force is required to lift the pyramid off the floor?
Homework Equations
F=δV
Where F is the force; δ=specific weight of the liquid; V is volume
The Attempt at a Solution
I'm not really sure if I analyze what it should look like, but here is my attempt.
Fv is the force by the fluid against the pyramid
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