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All,
Thanks for catching our mathematical error. My math teachers always did say to check your answers twice. After talking to the powers that be, the rate has been updated. However, the smallest possible time increment for our sign is 1 second. Thus, the counter has been set to add 1 ton of carbon every 2 seconds instead of every 1.37 seconds.
Thanks again.
~steve
Steve Yasukawa
Science On Wheels Teacher
206.269.5775
Pacific Science Center is an independent, not-for-profit educational institution that inspires lifelong interest in science, math and technology by engaging diverse communities through interactive and innovative exhibits and programs in every county of Washington state and beyond.
-----Original Message-----
From: Michael Driver [mailto:[log in to unmask]]
Sent: Fri 3/14/2008 08:40
To: [log in to unmask]
Subject: Re: math help!
ISEN-ASTC-L is a service of the Association of Science-Technology Centers
Incorporated, a worldwide network of science museums and related institutions.
*****************************************************************************
My calculations show that 23 million metric tons is equivalent to 1 metric ton every 1.37 seconds not once every 45 seconds as PSC's calculations would have you believe. Your calculation is good, I think theirs is wrong.
Michael C. Driver PhD
Director Information Services
Materials Research Society
724 779 3004 x401
-----Original Message-----
From: Informal Science Education Network [mailto:[log in to unmask]] On Behalf Of Katie Stofer
Sent: Friday, March 14, 2008 11:29 AM
To: [log in to unmask]
Subject: math help!
ISEN-ASTC-L is a service of the Association of Science-Technology Centers
Incorporated, a worldwide network of science museums and related institutions.
*****************************************************************************
I recently heard (it may have been here) of a new sign counting up
carbon emissions for the year. I'd like to do something similar here,
but in checking the math, I can't get the original sign's numbers to
work right. Any help appreciated. Here is the text I used (from Pac Sci
Ctr site):
"The sign began at zero on January 1 of this year, and increases by one
metric ton every 45 seconds. Our emission rate is based on a 2003 King
County study which found the county emits nearly 23 million metric tons
of carbon dioxide each year."
I found Maryland (the entire state) to emit about 80 million metric tons
per year. So, from high school conversions, I tried to find mmt/sec as
PSC did: 80 mmt/yr x 1yr/365dy x 1dy/24hr x 1hr/60min x 1min/60 sec =
2.54 mt/sec
Taking the reciprocal, I get 1 metric ton every 0.39 seconds, which is
off what I estimate it should be, according to PSC's calculations (80
mmt is about 4 times 23mmt, so we should produce emissions about 4 times
as fast, or about 1 mt every 10 seconds, not 1mt every 0.4 seconds). So
far, I haven't received any answer from PSC. Thoughts?
--
--
Kathryn Stofer
TerraLink Exhibit Manager
Maryland Science Center
601 Light Street
Baltimore, Maryland 21230
410/545-5976
410/545-5974 fax
BODYWORLDS - Coming to MSC Feb. 2 - Sept. 1, 2008!
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