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Re: [Phys-l] [PC-SPAM50]:Re: Coriolis Misconception



Richard,

I was looking at the header to this email and I think you missed a few
newsgroups.

Bob at PC

-----Original Message-----
From: phys-l-bounces@carnot.physics.buffalo.edu [mailto:phys-l-
bounces@carnot.physics.buffalo.edu] On Behalf Of Richard Hake
Sent: Wednesday, August 06, 2008 5:38 PM
To: PHYSHARE@LISTS.PSU.EDU
Cc: phys-l@carnot.physics.buffalo.edu;
ap-physics@lyris.collegeboard.com;
PHYSLRNR@LISTSERV.BOISESTATE.EDU
Subject: [PC-SPAM50]:Re: [Phys-l] Coriolis Misconception

M. Horton (2008), in his Physhare post titled "Re: Coriolis
Misconception" references the northern-hemisphere draining-bathtub
experiment of Ascher Shapiro (1962), but doesn't mention its
southern-hemisphere counterpart by Trefethen et al. (1965).

For the above and other references related to the Coriolis Effect see
"More on Coriolis myths and draining bathtubs" [Hake (1994)] and
"Coriolis myths and draining bathtubs" [Hake (2002)].

Quoting from Hake (1994) [references are updated]:

"The heroic efforts required for these bathtub-vortex observations
are summarized by Walker (2006), but are well worth reading in the
original. For the less heroic, or those averse to the splinters of
wooden bathtubs [Trefethen et al. (1965)], a plastic-pail bathtub
may be placed on a merry-go-round with an angular velocity omega of
about 10^4 greater than that of the Earth. Merry-go-round rotations
simulating northern and southern hemispheres then result in water
vortices around the drain that are, respectively, consistently
counterclockwise and clockwise. This experiment can be performed by
introductory-course students [Hake (1998)].

Richard Hake, Emeritus Professor of Physics, Indiana University
24245 Hatteras Street, Woodland Hills, CA 91367
Honorary Member, Curmudgeon Lodge of Deventer, The Netherlands.
<rrhake@earthlink.net>
<http://www.physics.indiana.edu/~hake/>
<http://www.physics.indiana.edu/~sdi/>


REFERENCES
Hake, R.R. 1992. "Socratic Pedagogy in the Introductory Physics
Laboratory," Phys. Teach 30: 546-552; updated version (4/27/98) at
<http://www.physics.indiana.edu/~sdi/SocPed1.pdf> (88 kB).

Hake, R.R. 1994. "More on Coriolis myths and draining bathtubs,"
Letters to the Editor, Am. J. Phys. 62(12): 1063; online to
subscribers at
<http://scitation.aip.org/dbt/dbt.jsp?KEY=AJPIAS&Volume=62&Issue=12>.
See also the two accompanying letters by Hanneken (1994) and
Robertson (1994).

Hake, R.R. 1998. Socratic Dialogue Inducing (SDI) Lab #3, "Circular
Motion and Frictional Forces," online at
<http://www.physics.indiana.edu/~sdi>. A Teacher's Guide is available
on request. SDI labs [see, e.g., Hake (1992)] are among the more
effective interactive-engagement methods and are freely available on
the web. Unfortunately, the Socratic Method is widely misunderstood
- see e.g., Hake (2007).

Hake, R.R. 2002. "Coriolis myths and draining bathtubs," online at
<http://tinyurl.com/6qa9ns>. Post of 11 Feb 2002 15:21:31-0800 to
Physhare, Phys-L, & PhysLrnR.

Hake, R.R. 2007. "The Socratic Method of the Historical Socrates,
Plato's Socrates, and the Law School's Socrates," online at
<http://tinyurl.com/5fueh9>. Post of 21 Jun 2007 13:43:05-0700 to
AERA-J, AERA-L, Phys-L, PhysLrnR, and POD.

Hanneken, J.W. 1994. "Coriolis myths and draining bathtubs," Am. J.
Phys. 62(12): 1063. online to subscribers at at
<http://scitation.aip.org/dbt/dbt.jsp?KEY=AJPIAS&Volume=62&Issue=12>.

Horton, M. 2008. "Re: Coriolis Misconception," Physhare post of 6 Aug
2008 06:09:20-0700; online at <http://tinyurl.com/6g2ue2>.

Robertson, C. 1994. "Still more on Coriolis myths and draining
bathtubs - films and video tapes," Am. J. Phys. 62(12): 1063; online
to subscribers at at
<http://scitation.aip.org/dbt/dbt.jsp?KEY=AJPIAS&Volume=62&Issue=12>.

Shapiro, A.H. 1962. "Bathtub Vortex," Nature 196: 1080 - 1081 (1962);
film Vorticity, Educational Services, Inc., Watertown, Mass., 1961);
film loop #FM-15, The Bathtub Vortex, ibid., 1963.

Trefethen, L.M., R.W. Bilger, P.T. Fink, R.E. Luxton, and R.I.
Tanner. 1965. "Bathtub Vortex in the Southern Hemisphere," Nature
207: 1084-1085.

Walker, J. 2006. "The Flying Circus of Physics," 2nd edition. John
Wiley. Walker, on page 92, gives other references germane to the
experiments. Amazon.com information at <http://tinyurl.com/59urxv>.
Note the "Search Inside" feature.


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