Calculating Gravitational Potential Energy of a Fluid Above a Reference Line

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SUMMARY

The discussion focuses on calculating the gravitational potential energy (U) of a fluid above a reference line using the formula U = 1/2ρAg(y-h)², where ρ represents fluid density, A is the cross-sectional area, g is the acceleration due to gravity, y is the height of the fluid, and h is the height of the reference line. The derivation confirms that the potential energy can be expressed without calculus, simplifying the understanding of fluid mechanics. The formula is validated by showing equivalence to the standard equation U = mgh, demonstrating its applicability in practical scenarios.

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cwrn
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I got a quick question regarding the potential energy of a fluid (see picture). If I want to express the potential energy of a fluid (with a given volume) above the reference line x, using nothing but the given variables/constants, would this be the correct way to do so?

picture
 
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Without doing any calculus, the gravitational potential energy of a mass from a distance from x to it's center of mass= h is:
U = mgh
= (ρAs)(g)(s/2)
= 1/2ρAgs2
= 1/2ρAg(y-h)2

Which gives the same answer.
 

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