Re: Beginner's Question about Bernoulli and Tanks

From: PD (pdraper_at_yahoo.com)
Date: 02/11/05 

Date: 11 Feb 2005 07:12:45 -0800

anebt2@peoplepc.com wrote:
> Hello,
>
> I'm stuck with the conceptual understanding of using Bernoulli with
> open and closed tanks.
>
> With open tanks, I don't understand why both pressures at the top and
> bottom of the tank are both atmospheric and thus cancel in the
> equation. I keep thinking that the pressure in the bottom of the tank
> would be greater than the pressure on top (similar to the pressure at
> the bottom of the ocean being greater than the pressure on the
> surface).

I'm guessing that the problem has a hole in the side of the tank
somewhere near the bottom, and they're asking about the speed of the
fluid coming out of the hole.

What you need to consider in this case is the pressure that is pressing
on the top surface of the water (1 atm if an open tank), and the
pressure that is pushing on the water at the hole (1 atm if it's the
atmosphere that's pushing on the water there).

PD

>
> With closed tanks, I'm even more confused and don't know how to use
> Bernoulli with these types of problems at all.
>
> If anyone knows how to explain this conceptually, I would very much
> appreciate it.
>
> Thanks.
> Mike

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