Date: Mon, 3 Feb 2003 09:47:10 -0500 (EST)

Author: Richard Berg

Subject: Re: physics first

Post:


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Interesting conjecture. But here you seem to be trying to use the
frequency of the can as a measure of the pressure. I doubt that's a
fair test. Perhaps the change in pressure when shaken is not enough to
change the frequency very much. The additional tension on the surface
of the can is probably a small change. I'd want to see a plot of can
pressure vs. resonant frequency.

Paul

On Friday, January 31, 2003, at 03:35 PM, Thomas J Senior wrote:

> The frequency of the ping
> seems to depend on pressure, since it drops tremendously when the can
> is
> opened. Shaking the can does not change the frequency (thus the
> pressure) but the bubbles damp out the ringing more quickly.
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Interesting conjecture. But here you seem to be trying to use the
frequency of the can as a measure of the pressure. I doubt that's a
fair test. Perhaps the change in pressure when shaken is not enough
to change the frequency very much. The additional tension on the
surface of the can is probably a small change. I'd want to see a plot
of can pressure vs. resonant frequency.


Paul


On Friday, January 31, 2003, at 03:35 PM, Thomas J Senior wrote:


The frequency of the ping

seems to depend on pressure, since it drops tremendously when the can
is

opened. Shaking the can does not change the frequency (thus the

pressure) but the bubbles damp out the ringing more quickly.

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From reberg@physics.umd.edu Mon Feb 3 09:38:43 2003
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Date: Mon, 3 Feb 2003 09:47:10 -0500 (EST)
From: Richard Berg
To: tap-l@listproc.appstate.edu
Subject: Re: physics first
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Mary,

According to the Washington Post, January 28, 2003 (Teaching Physics First
Ignites Debate, by Jay Mathews, Washington Post Staff Writer), there are
six high schools in suburban DC Montgomery County, Maryland, that teach
physics first. A physics specialist and former Montgomery County physics
teacher, Sue Schwartz, now with the Maryland State Department of Education
in Baltimore, is leading the Maryland effort.

Another teacher is Judith L. Anderson of the Ursuline Academy in Kirkwood,
MO.

Apparently Leon Lederman, of the American Renaissance in Science Education
and Fermilab, says there are about 200 schools doing it, so he must know
of them.

I can get you more information if you need it, or even scan and post the
Washington Post article.

Dick Berg


On Sat, 1 Feb 2003 Winnmmw@aol.com wrote:

> Are any of you high school teachers teaching physics in the 9th or 10th grade
> - before chemistry and biology?? If so, how is it working for you?? Any
> first hand information would be useful.
> Thanks,
> Mary Winn
>

***********************************************************************
Dr. Richard E. Berg, Director Phone: (301) 405-5994
Lecture-Demonstration Facility FAX: (301) 314-9525
Department of Physics e-mail reberg@physics.umd.edu
University of Maryland www.physics.umd.edu/lecdem
College Park, MD 20742-4111
***********************************************************************
From Paul.Nord@valpo.edu Mon Feb 3 10:01:03 2003
Date: Mon, 3 Feb 2003 09:08:10 -0600
Subject: Re: physics first
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Cc: Paul Nord
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From: Paul Nord
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