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Homework Statement
The following shows a cross section through a tank with a rectangular sloping gate that is 10 m long and 4 m wide (width is measured into the page). The gate is hinged along its top edge and held closed by a force at its bottom edge at A that acts perpendicular to Gate AB. Friction in the hinge and the weight of the gate can be neglected.
What is the pressure at A?
Homework Equations
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The Attempt at a Solution
So I had the flu for this and don't quite know where to begin. I know you need to solve for pressure, but the way you do that is very confusing. I know it also involved centroids (I think at least) so I can apply what I'm learning about that (here) once I know what equations and theories to use for water pressure.