Re: Beginner's Question about Bernoulli and Tanks
anebt2_at_peoplepc.com
Date: 02/12/05
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Date: 11 Feb 2005 17:05:36 -0800
PD wrote:
> It is if you're not at the hole. If you're at the hole, the pressure
is
> atmospheric, because the NET force on the bit of water flying out the
> hole is zero (it's leaving at constant velocity), and the air pushing
> in is obviously at atmospheric pressure, so the water behind the
flying
> bit must be pushing with atmospheric as well.
This is just the answer I was looking for! The textbooks never
explained WHY; neither did any web site. Thank you very much. It's a
simple explanation, but when one is a beginner the formulas and
concepts get crowded and take time to gel.
> Now, I do think it's worthwhile raising your hand in class and asking
> in your best furrowed-brow expression:
> "Gee, Professor, I understand the pressure in the fluid right at the
> hole is atmospheric, just like at the top of the tank. But what about
> at the other side of the tank, at the same depth as the hole?
Shouldn't
> that be at higher pressure because it's under all that water above
it?"
> Then it will be your turn to see if the professor squirms and gibbers
> for a bit.
Cool!
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