Date: Tue, 25 Oct 2011 17:00:11

Author: Tom Gill

Subject: Re: Two Speeds

Post:

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How about a bubble tube?
http://www.teachersource.com/Density/Viscosity/SpeedoftheBubbleTubeSets.aspx





From: tap-l-owner@lists.ncsu.edu [mailto:tap-l-owner@lists.ncsu.edu] On
Behalf Of Zani, Gerald
Sent: Tuesday, October 25, 2011 10:11 AM
To: tap-l
Subject: [tap-l] Two Speeds



Tappers,

I need a demo that shows a pattern moving at a speed that is slower than the
particles within the pattern.

For example, a pulse traveling in a slinky shows the opposite effect. Each
coil of a slinky will individually move slowly while the wave pulse travels
quickly.

That is the opposite of what I am seeking. All the wave machines that I
have, longitude wave machines, transverse wave machines, slinky, spring, and
string all show the elements of the material moving slower than the wave
pattern itself.

I need the opposite.

I am seeking to show a pattern that will move slow and the matter within the
pattern move fast.

One example I can think of which I cannot show in class is a water wave in
the ocean. The water wave itself moves slow, while the water within the
wave circulates about quickly.

Any ideas?

Thanks,
- Jerry

BTW for the curious this is to show an analogy for the Astronomical behavior
of the Spiral Density Wave of a galaxy and the motion of the stars within
the spiral density wave.



--
Gerald Zani
Demonstration Manager
Physics
Brown University
(401) 863-3964


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How about a bubble tube? http://www.teachersource.com/Density/Viscosity/SpeedoftheBub=
bleTubeSets.aspx From:=
=
tap-l-owner@lists.ncsu.edu [mailto:tap-l-owner@lists.ncsu.edu] On =
Behalf Of Zani, GeraldSent: Tuesday, October 25, 2011 =
10:11 AMTo: tap-lSubject: [tap-l] Two =
Speeds Tappers,I need =
a demo that shows a pattern moving at a speed that is slower than the =
particles within the pattern.For example, a pulse traveling in a =
slinky shows the opposite effect. Each coil of a slinky will =
individually move slowly while the wave pulse travels =
quickly.That is the opposite of what I am seeking. =
All the wave machines that I have, longitude wave machines, transverse =
wave machines, slinky, spring, and string all show the elements of the =
material moving slower than the wave pattern itself.I need the =
opposite. I am seeking to show a pattern that will move =
slow and the matter within the pattern move fast.One example I =
can think of which I cannot show in class is a water wave in the =
ocean. The water wave itself moves slow, while the water within =
the wave circulates about quickly.Any ideas?Thanks,- =
JerryBTW for the curious this is to show an analogy for the =
Astronomical behavior of the Spiral Density Wave of a galaxy and the =
motion of the stars within the spiral density wave.-- Gerald ZaniDemonstration =
ManagerPhysicsBrown University(401) =
863-3964
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