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Phys5
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Homework Statement
I am trying to study for an exam and a section in the book on pressure on a plane is shown in the attached picture. I am trying to understand how equation15.16 was derived. I know normally the line of action is found using moments so this seems to be a short cut but I can'tunderstand how the book got to this equation. Any help would be muchappreciated. Thanks![/B]