Physics
Seminar
Randall D. Peters |
Friday,
September 9, 2005, 10am |
Some Physics of Hurricanes |
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This talk is concerned with how
hurricanes work, and will be focused toward a non-scientific audience. Various
homemade items, along with a commercial Stirling engine, will be used to
illustrate (i) the origin of cyclonic motion due to Earth’s spin, (ii)
thermo-mechanics whereby natural heat transport does incredible work against
friction between the rotating air mass and the earth’s surface, and (iii) how
the storm’s interaction with our planet can not only do catastrophic damage,
but also can set it “vibrating like a bell”. The vibration features will be described
with data from two novel instruments invented by the speaker. One of these
seismic devices, a modernized conventional pendulum, drew attention from
around the world, following the tsunami of 26 December 2004. The ‘plumb bob’
type device, using a sensor patented by the speaker, is described in the
article, ‘An affordable earthquake detector’, on page 101 of the April issue
of Popular Science. Most recently this pendulum was used to monitor hurricane
Katrina during her visit to the Gulf coast. It yielded data of the type which
caused the writer of the following article:
http://www.newscientist.com/article.ns?id=mg18625065.900 to state that the speaker is the first
person to observe a particular form of earth vibrations caused by the
hurricane. Consistent with the enormous damage inflicted by this storm, some
of these eigenmode oscillations are unmistakable in the records generated
when hurricane Katrina was most energetic. |