Date: 12 Sep 2003 15:58:57 -0400

Author: "Zigmund J. Peacock"

Subject: Re: 5D40.30 - radioactive discharge

Post:

We freeze a thermocouple in ice and then dunk it in some LN2 for a
little while to get it well below freezing temp and then put in in a
beaker of water over a burner. We then plot the temperature over time.
First all the energy goes into heating the ice then the curve flattens
out when the ice starts melting and all the energy to into that. Then
the curve rises again as the water heats up and flattens out when the
water starts boiling. It runs in the background during class and you
just refer to it time and again when the interesting bits take place

mike

On Fri, 2003-09-12 at 14:51, Gerald Zani wrote:
> Tappers,
>
> How do people demonstrate latent heat?
>
>
> Thanks,
> Jerry
> Gerald Zani e-mail: Gerald_Zani@brown.edu
> Manager of Demonstrations phone: (401) 863-3964
> Department of Physics FAX: (401) 863-2024
> Brown University Providence, RI 02912-1843 USA
>
> URL http://www.physics.brown.edu/users/staff/zani/index.html
> URL http://www.physics.brown.edu/Studies/Demo/
>
> Do a little more of that work which you have confessed to be good,
> Which you feel that society and your most Just Judge rightly demand of you.
> Cultivate the tree which you have found to bear fruit in your soil.
> If you have any experiments you would like to try, try them.
> Now's your chance.
> Henry David Thoreau, Journal entry, 1850.
From peacock@physics.utah.edu Fri Sep 12 13:31:04 2003
Message-ID: <3F6229CD.180C9728@physics.utah.edu>
Date: Fri, 12 Sep 2003 14:17:17 -0600
From: "Zigmund J. Peacock"
Organization: University of Utah , Department of Physics
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To: tap-l@listproc.appstate.edu
Subject: Re: 5D40.30 - radioactive discharge
References: <8DB9C75E-E201-11D7-B96B-000393B080FA@valpo.edu> <5.2.1.1.1.20030912122427.00b79808@physics.montana.edu> <008001c3795e$a130ea10$96245d81@lecturedemo>
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Cliff, that would be Southern Utah, up here we didn't get that glow in the
dark dusting. Zig

Cliff Bettis wrote:

> I hope Zig didn't hear that!
>
> Cliff
>
> ----- Original Message -----
> From: "Jerry DiMarco"
> To:
> Sent: Friday, September 12, 2003 1:28 PM
> Subject: Re: 5D40.30 - radioactive discharge
>
> > Your coach must recruit from Utah and Nevada...
> >
> > Jerry
> >
> >
> > At 12:38 PM 9/12/2003, you wrote:
> > >Dale,
> > >
> > >We may be over regulated but at least the only people walking around
> campus
> > >looking like mutants are football players ;-) ...
> >
> >
> > <><><><><><><><><><><><><><><><><><><><><><><><><><><><><>
> >
> > Jerry DiMarco
> > Manager of Lecture Demonstrations and Instructional Labs
> > Montana State Univ., Physics Dept.
> > Bozeman, MT
> >
> > Our Motto: "There's a demo in there somewhere."

--
Zigmund J. Peacock WWW.physics.utah.edu/people/staff/peacock.html
University of Utah/Physics peacock@physics.utah.edu
115 SOUTH 1400 EAST #201 Tel 801 581 6602
SALT LAKE CITY UT 84112-0830 Fax 801 581 4801

"We sleep safely in our beds because rough men stand ready in
the night to do violence to those who would do us harm"
-- George Orwell

"All that is necessary for the triumph of evil is that good
men do nothing!"
-- Edmund Burke

From dwilley+@pitt.edu Fri Sep 12 13:43:55 2003
Date: Fri, 12 Sep 2003 16:26:47 -0400
From: David Willey
Subject: Re: linear expansion
In-reply-to: <5.2.1.1.1.20030912122005.00b70068@physics.montana.edu>
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The one that uses a tube of either copper, aluminum or steel as the
sample. Catalog # TD-8558A. It's supposed to be "Easier, More
Sophisticated and More Accurate than Traditional Equipment " , which has
not been my experience with it,
cheers,
David
P.S. I've never yet met a thermistor I trust ;-)

Jerry DiMarco wrote:

> Which one do you have - there are 3 shown in the catalog...
>
> Jerry
>
>
> At 01:22 PM 9/12/2003, you wrote:
>
>> Hi Tappers,
>> I wrote in a couple of days ago about problems I'm having with
>> PASCO's linear expansion apparatus. As yet, no one has picked up on
>> this thread. Am I to assume no one else does this experiment, or is
>> it that everyone else gets great results?
>> cheers,
>> dai
>>
>
From cbettis@unlserve.unl.edu Fri Sep 12 13:44:36 2003
Message-ID: <00dd01c3796c$282247f0$96245d81@lecturedemo>
From: "Cliff Bettis"
To:
References:
Subject: Re: Puzzle of two Salts (wasRe: 5D40.30 - radioactive discharge)
Date: Fri, 12 Sep 2003 15:26:33 -0500
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Duane,

It was a food irradiator designed to sterilize food quickly. I gave the salt
a much higher exposure than one would ordinarily give, say, your Twinkies.

Cliff
----- Original Message -----
From: "Duane Warn"
To:
Sent: Friday, September 12, 2003 2:54 PM
Subject: Puzzle of two Salts (wasRe: 5D40.30 - radioactive discharge)


> Cliff,
>
> Isn't 500 C fo Cobalt 60 quite stout? Where can that stout of source be
found?
>
> Duane
>
>
> >>> cbettis@unlserve.unl.edu 09/12/03 12:58PM >>>
> In case others are interested:
>
> I used 737 g of Morton's salt (standard cylindrical package) irradiated
for
> 3 days with a 500 C Cobalt 60 source (food irradiator). It turns the NaCl
a
> yellowish brown color (color centers) and when you drop some on a hot
plate,
> it scintillates (very pretty). I present it as the puzzle of two salts. I
> show the students two salts, KCl and NaCl , and tell them one of them has
> been irradiated with a very strong gamma source and the other is as it is
> from the store. One is radioactive and the other is not, one will glow in
> the dark (with a little heat) and the other will not. Which is which?
>
> Cliff
>
From anthony_lapinski@pds.org Fri Sep 12 14:08:26 2003
Message-id:
Date: Fri, 12 Sep 2003 16:54:58 -0400
Subject: Re: AIP Reports
To: tap-l@listproc.appstate.edu
Cc: tap-l@listproc.appstate.edu
From: "Anthony Lapinski"
References:
<3F61CA78.1030501@physics.syr.edu>
<3F61D009.1030203@vt.edu>
<3F61D3E2.1040604@physics.syr.edu>
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I believe it's important to teach our students how to think critically,
not just plug numbers into formulas. The goal of my course, even honors,
is not any type of "exam." I'm glad I teach at a private school.

tap-l@listproc.appstate.edu writes:
>That's what the argument it all about. The teachers claim that the exam
>is way too difficult. Difficult questions are given more weight than
>easier questions. So, if a student gets 75% of the questions correct,
>he may still get a score of 50 and fail because he got the hard ones
>wrong.
>
>I think that's another reason why the teachers are in an uproar here,
>Low scores make them look bad. We'll have to wait and see how this all
>washes out.
>
>Sam
>
>Clark Snelgrove wrote:
>
>> Is the New York exam a good physics exam? The Utah state exam in
>> physics is a joke and I don't think it would say anything meaningful
>> about my students and what they have learned or not learned in
>> physics. Still if students don't do well on a state exam the blame
>> will be put on the teachers even if the exam is a joke.
>> Clark Snelgrove
>> Virginia Tech Physics
>> (and former Utah High School Physics teacher)
>

From jhester@mtu.edu Fri Sep 12 16:00:38 2003
Date: Fri, 12 Sep 2003 13:40:12 -0400
From: Jerry Hester
Subject: Fishing
To: tap-l
Message-id: <3F6204FC.1050306@mtu.edu>
Organization: Michigan Technological University
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Hey Zig,
How come you aren't here seeking the $250 K dollar first prize in the
Mercury Trail Walleye fishing Tournament? There's also a million dollar
prize for he who breaks the state Walleye record.
There are over 50 "professional" fisherpeople competing and boy do they
have some fancy equipment.

--
Jerry Hester
Jhester@mtu.edu
Laboratory/Lecture Demonstrations Coordinator
Department of Physics
Michigan Technological University
1400 Townsend Drive
Houghton, MI 49931-1295
Phone: (906) 487-2273
Fax: (906) 487-2933


From kmdudley@unity.ncsu.edu Sat Sep 13 10:26:34 2003
Message-ID: <3F634F58.6030405@unity.ncsu.edu>
Date: Sat, 13 Sep 2003 13:09:44 -0400
From: Kevin Dudley
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To: tap-l@listproc.appstate.edu
Subject: Ducks' quacks echo
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This story, number 10 from the BBC's "10 things we didn't know this time
last week" article:

http://news.bbc.co.uk/1/hi/sci/tech/3086890.stm

I thought it was kinda neat...

--
-Kevin

================================================
Kevin M. Dudley -*- Director of Demonstrations
NC State University -**- Department of Physics
mailto:kevin_dudley@ncsu.edu -*- Phone: 515-2910
================================================
\ NCSU Physics Instructional Demo Facility /
\ Im: http://demoroom.physics.ncsu.edu /
\ Re: Cox Hall, Room 202 /
========================================

From stein@aps.org Sat Sep 13 14:57:57 2003

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