Re: [Phys-l] question about Bernoulli

[brian whatcott <betwys1@sbcglobal.net>]

On 11/19/2010 10:13 PM, Carl Mungan wrote:
> Hmm, that is a good question. My first thought goes as follows: I suppose point A to be inside a constriction and point B to be outside (let's say downstream and call that the +x direction) of the constriction./snip/
> Now to turn on the fluid motion. But in A's frame, the fluid is at rest. But the pipe moves to the right. /snip/
> Carl E Mungan, Assoc Prof of Physics

Hmmmm....you describe point B as downstream of point A.       Fluid 
flows from A to B.

Now, following JohnM's lead, you consider the situation from the frame 
of a parcel of fluid at point A.
With A fixed, the pipe is moving to the LEFT, and the slower fluid at B 
is evidently approaching A.

Is that what you had in mind?

Brian W