Date: Fri, 21 Feb 2003 08:08:52 -0500

Author: Gerald Zani

Subject: Homemade Hall Effect Sensor

Post:

Tappers,

Has anyone constructed a homemade Hall Effect Sensor? GZ


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 STribiano@bmcc.cuny.edu Fri Feb 21 08:10:48 2003
Subject: Re: age of the Sun
To: tap-l@listproc.appstate.edu
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Dear Anthony,

The sun will only burn H that is at the core of the sun - or more
specifically - it will burn whatever H is at high enough temp and pressure
to undergo fusion. whatever isn't hot enough, won't burn. the H burns and
leaves He ash (among other things), then He begins to burn in the core
(leaving carbon ash) when the core has contracted enough to make it hot
enough to burn.

So, the entirety of the sun does not serve as fuel for its entire life,
just the core. Does that address your question? or did I miss it?

Sincerely,
Shana



"Anthony Lapinski"
org> cc:
Sent by: Subject: age of the Sun
owner-tap-l@listproc.a
ppstate.edu


02/20/2003 05:37 PM
Please respond to
tap-l






I'm teaching about the Sun in astronomy now. Through fusion, the
proton-proton chain, and E = mc2, I read that every second the Sun changes
600 billion kg of H into 595.8 billion kg of He. That means 4.2 billion kg
are converted into energy each second. The Sun's mass is 2 x 1030 kg. The
Sun's "lifetime" is predicted to last another 5 billion years.

Maybe my calculations are incorrect, but I can't seem to get anywhere
close this number. My "age" is much higher. Can someone tell me how the
age (5 By) is determined? Does it assume a model of stellar evolution
where the fusion rate decreases a few billion years from now? Most
textbooks don't show this calculation.





From papirio@physics.umass.edu Fri Feb 21 08:35:21 2003
Date: Fri, 21 Feb 2003 08:33:45 -0500
From: Tony Papirio
Subject: Re: Homemade Hall Effect Sensor
To: tap-l@listproc.appstate.edu
Message-id: <3E562AB9.C9953F37@physics.umass.edu>
Organization: Physics Dept./ Uniiversity of Massachusetts at Amherst
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Yes Jerry, I made one.

Tony


--

Tony Papirio
Lab Director Physics Teaching Labs
Dept. of Physics (fax) 413-545-1691
218 Hasbrouck Physics Lab (voice)413-545-1296
University of Massachusetts Email: papirio@physics.umass.edu
Amherst, MA, 01003-3720
http://www-unix.oit.umass.edu/~tpapirio

http://www-unix.oit.umass.edu/~tpapirio/LAB_HOME.HTML


From anthony_lapinski@pds.org Fri Feb 21 09:40:21 2003
Message-id:
Date: Fri, 21 Feb 2003 09:45:06 -0500
Subject: Re: age of the Sun
To: tap-l@listproc.appstate.edu
Cc: tap-l@listproc.appstate.edu
From: "Anthony Lapinski"
References:
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Shana:

Yes. Thanks! I'm still trying to do a numerical calculation for the age...

tap-l@listproc.appstate.edu writes:

Dear Anthony,

The sun will only burn H that is at the core of the sun - or more
specifically - it will burn whatever H is at high enough temp and pressure
to undergo fusion. whatever isn't hot enough, won't burn. the H burns and
leaves He ash (among other things), then He begins to burn in the core
(leaving carbon ash) when the core has contracted enough to make it hot
enough to burn.

So, the entirety of the sun does not serve as fuel for its entire life,
just the core. Does that address your question? or did I miss it?

Sincerely,
Shana




"Anthony Lapinski"

tap-l@listproc.appstate.edu
org> cc:

Sent by: Subject: age of the
Sun
owner-tap-l@listproc.a

ppstate.edu





02/20/2003 05:37 PM

Please respond to

tap-l









I'm teaching about the Sun in astronomy now. Through fusion, the
proton-proton chain, and E = mc2, I read that every second the Sun changes
600 billion kg of H into 595.8 billion kg of He. That means 4.2 billion kg
are converted into energy each second. The Sun's mass is 2 x 1030 kg. The
Sun's "lifetime" is predicted to last another 5 billion years.

Maybe my calculations are incorrect, but I can't seem to get anywhere
close this number. My "age" is much higher. Can someone tell me how the
age (5 By) is determined? Does it assume a model of stellar evolution
where the fusion rate decreases a few billion years from now? Most
textbooks don't show this calculation.






From mmcfarla@darwin.helios.nd.edu Fri Feb 21 10:03:44 2003
Date: Fri, 21 Feb 2003 10:05:21 -0500 (EST)
From: Michael McFarland
To: tap-l@listproc.appstate.edu
Subject: Re: Homemade Hall Effect Sensor
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Jerry,

We made one. If you would be interested, let me know and I will email
you directly with design diagram attached. It's Howard Blackstead's
basic idea. Great idea, too. Saved us a lot of money.

Mike

* * * * * * * *

Mike McFarland
Resources for Instructional Labs and Lectures

mmcfarla@nd.edu
Physics, University of Notre Dame

225 Nieuwland Science Hall
Notre Dame, IN 46556-0338

(574) 631-7057
(574) 631-5952 (FAX)

(574) 254-3036 (Pager: at the beeps, enter the number that I should call.
Or, in NSH, enter the number of the room in which you need assistance.)

On Fri, 21 Feb 2003, Gerald Zani wrote:

> Tappers,
>
> Has anyone constructed a homemade Hall Effect Sensor? GZ
>
>
> 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 Feb 21 10:46:36 2003
Message-ID: <3E564B63.E68DB33D@physics.utah.edu>
Date: Fri, 21 Feb 2003 08:53:07 -0700
From: "Zigmund J. Peacock"
Organization: University of Utah , Department of Physics
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Karen, here's a bit of serendipity.
I walked into the conference room to change a projector lamp and laying
on
the table was a funny narrow roll of clear sticky tape.
It is birefringent, very good luck I'd say.
I found the last one in a similar way, I think the chinese students have
a line on
this cellophane tape that we need to exploit. Zig

KBouff@aol.com wrote:

> I don't know if anyone has suggested this, but regular cellophane packing
> tape, available at Staples is birefringent and works well.
> Karen Bouffard

--
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 reberg@physics.umd.edu Fri Feb 21 13:36:07 2003
X-Authentication-Warning: student1.physics.umd.edu: reberg owned process doing -bs
Date: Fri, 21 Feb 2003 13:37:43 -0500 (EST)
From: Richard Berg
To: tap-l@listproc.appstate.edu
Subject: Shive wave machine
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So here;s the problem:

We have a Shive wave machine that is in reasonable condition (or that can
be bent into reasonable condition) except that some of the rods have come
loose from the main spine and just flop around. We tried unsuccessfully
to glue them back with epoxy.

We asked about spot welding the crosspieces back to the spine, but our
shop guru tells us that the only machine he knows about is the wrong
geometry - you have to stick the item being welded into the welder and it
can't be done.

Have any of you been faced with this problem (har, har)? After you have
stopped laughing, can you tell me what you did to fix this problem (har,
har)? After you have stopped laughing, does anyone have any suggestions?

Dick Berg

***********************************************************************
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 yue@physics.utexas.edu Fri Feb 21 14:03:01 2003
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