Re: [Phys-l] question about Bernoulli

[William Robertson <wrobert9@ix.netcom.com>]

Is it safe to say that most of the "everyday" examples of the  
Bernoulli effect you read about are not examples of the Bernoulli  
effect? If it's not a change in cross sectional area that results in a  
change in velocity due to a pressure difference, it's not Bernoulli?

And with the syringe, air will go out the side hole, not in. By  
depressing the plunger, you are increasing the air pressure inside the  
syringe compared to the outside air, not decreasing it.

Bill


William C. Robertson, Ph.D.


On Nov 22, 2010, at 9:14 PM, John Denker wrote:

> Bernoulli's principle is essentially a force-balance proposition,
> which (as always) is the same as a momentum-conservation proposition.
>
> There /may/ be other valid ways of thinking about it, but I've
> never seen any.  (I've seen plenty of invalid ways.)
>
> The wikipedia article gets several fundamental points wrong.
>
> For more on this, see
>  http://www.av8n.com/physics/bernoulli.htm
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