Re: pinhole Inter-disciplinary geometry

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From: John or Jan Lahr (johnjan@lahr.org)
Date: Sat Mar 15 2003 - 10:04:29 PST 

Message-Id: <5.1.0.14.2.20030315105210.018e1d80@mail.attbi.com>
Date: Sat, 15 Mar 2003 11:04:29 -0700
From: John or Jan Lahr <johnjan@lahr.org>
Subject: Re: pinhole Inter-disciplinary geometry

Hi Jhumki,

A natural for geometry is finding the location of an earthquake based on
the distance
to three stations. For local earthquakes, the distance is approximately 8
km for each
second of time lapse between the P (fastest wave) and the S (slower) wave.

For earthquake educational resources, check out the IRIS site:
http://www.iris.washington.edu/edu/resources.htm

and also Larry Braile's site:
http://www.eas.purdue.edu/~braile/

If you want the students to burn off a bit of energy and really learn about
the S-P
earthquake-location method, then you might try Larry's "Walk-Run Activity"
here:
http://www.eas.purdue.edu/~braile/edumod/walkrun/walkrun.htm

For another exercise, how about computing the travel time versus distance on
an "Earth" with constant velocity all the way from the crust to the
core. How does
this compare with the travel times actually observed for seismic waves and what
does this say about how the velocity of the Earth actually does change with
depth?
See: http://www.eas.purdue.edu/~braile/edumod/constvel/constvel.htm

Cheers,
John

At 06:59 AM 3/15/2003, you wrote:
>To follow up on Charlotte's question, do you have recommendations for
>curricula and lessons that link geometry with art, architecture,
>astronomy, buiding/engineering, mechanics, biology, fractals ... and
>anything else?
>
>Do any of you do this on your classes?
>
>The goal is to motivate geometry through interesting, real problems. So
>any suggestions would be most helpful.
>
>Thanks,
>Jhumki
>
>
>
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