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-----Original Message-----
From: phys-l-bounces@carnot.physics.buffalo.edu [mailto:phys-l-
bounces@carnot.physics.buffalo.edu] On Behalf Of William Robertson
Sent: Thursday, November 18, 2010 5:55 PM
To: betwys1@sbcglobal.net; Forum for Physics Educators
Subject: Re: [Phys-l] question about Bernoulli
Yes, I believe you can omit the hole. Doesn't Bernoulli say that the
pressure on the inside of the syringe wall will be less than the
pressure outside due to the increased velocity inside?
Bill
William C. Robertson, Ph.D.
On Nov 17, 2010, at 6:11 PM, brian whatcott wrote:
Probably better to wait, as you say. :-)
The reduction in air pressure in a duct due to its motion requires
no
side hole and external molecular collisions!
B
On 11/17/2010 6:57 PM, Bernard Cleyet wrote:
Not drag, but push.
The thermal motion outside the cylinder near and at the hole
results in diffusion into the cylinder. The net motion of the gas
inside is in the direction of the piston, so those molecules
collide w/ those formerly outside resulting in a partial vacuum
(relatively) at the hole, etc.
bc waiting for JD. and thinks it's similar to the operation of a
diffusion pump.
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_______________________________________________
Forum for Physics Educators
Phys-l@carnot.physics.buffalo.edu
https://carnot.physics.buffalo.edu/mailman/listinfo/phys-l