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## Homework Statement

So imagine a barrel with the area on top = ∏r^2

There is a tube of water 12 meters high ontop of the barrel.

What is the net force exerted on the barrel?

F = PA

F = Density*Height*Gravity*(Area of barrel)

How come the volume of water in the tube isn't a factor in the net force? Only the area of the top of the barrel matter? I used this equation and I got the right answer. My teacher said the volume of water in the tube DOESN"T matter, and I don't understand how that is possible. More total water = more total force?? Apparently not... Help me understand :)