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## Homework Statement

During the calculation of y

_{R}in fluid mechanics problem, hydrostatic force on a plane surface

## Homework Equations

y

_{R}= y

_{c}+[itex]\frac{I_xc}{y_c×A}[/itex]

## The Attempt at a Solution

I can see

__how__it is calculated but I've read through the chapter and I don't see how it is described. The textbook is

*Fundamentals of Fluid Mechanics (6th Ed.)*by Munson.