I can do vertically submerged fluid force problems. One portion of my book says:(adsbygoogle = window.adsbygoogle || []).push({});

If a flat surface is immersed so that it makes an angle of [itex]0 \leq \theta \geq \frac{\pi}{2}[/itex] with the vertical, then the fluid force on the surface is given by:

[itex]F=\int^b_a \rho h(x)w(x)sec\theta dx[/itex]

Can someone explain exactly what the sec(theta) is giving me; how exactly this equation changing the original equation of a vertically submerged surface. I never took trig., so please dumb it down in that area

If it helps, just made a diagram. Is this the correct angle in the equation?

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# Fluid pressure; inclined angle

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