# Fluids Problem

1/2/3. Homework Statement and equations

Hi everyone,

So, I have a fluids problem to do and I think there may be a slight typo or maybe I am missing something. The image of the problem is attached.

So, the only problem I have is how L is defined. Since L is defined from below the zero line, shouldn't Poil*G*L, instead be written Poil*G*l/2? To me, it seems the system drops l/2 then rises L.

Perhaps, I am missing something...

Thanks!

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Redbelly98
Staff Emeritus
Homework Helper
1/2/3. Homework Statement and equations

Hi everyone,

So, I have a fluids problem to do and I think there may be a slight typo or maybe I am missing something. The image of the problem is attached.

So, the only problem I have is how L is defined. Since L is defined from below the zero line, shouldn't Poil*G*L, instead be written Poil*G*l/2? To me, it seems the system drops l/2 then rises L.

Perhaps, I am missing something...

Thanks!
As you say, the system drops l/2, but that drop is in water. Hence the +l/2 term in the expression containing ρwater.

Then the rise of l is entirely in oil, so there should be a full l, not l/2, accompanying the ρoil term.

Hope that helps.

But, if the system has a net drop of l/2 how can the oil raise a full l? Do I not measure from the zero point, or do I have to measure from the change in height of the whole system?

Additionally, at the zero line point in t, was l/2 already above the 0 line? If so, then this would make sense. Thanks for the help!

Redbelly98
Staff Emeritus