Re: Another Rotating Cylinder Problem - explain from moving frame view

On Fri, 14 Apr 2006 18:29:50 +0100, "Martin Hogbin"
<goatREMOVETHIS123@xxxxxxxxxx> wrote:


"David" <dseppala@xxxxxxxxxxxxx> wrote in message news:5e5v32hhd167p57ikjfcvnfm82o1thjecu@xxxxxxxxxx
Can anyone explain this rotating disk problem from the point of view
of a moving observer?

Davis Seppala is one of the mysteries of this group. Unlike
Spaceman, for example, he is smart enough to dream up
endless SR puzzles, many of them involving accelerating
reference frames, yet by his own admission he has practically
no understanding of SR.

Is he really an expert on the subject testing posters'
understanding?

Is he a bunch of psychology students performing
some kind of experiment on us all?

Is he just a troll who delights in stirring up discussion
and argument?

Any suggestions?
He is none of the above. David's understanding of Einstein's notions
so far is much like David's comprehension of E. M. Escher's drawings.
He gets to points in problems where there seems to be contradictory
results as in his posting on 4/10/2006 where a moving rigid rod is
always parallel to the x-axis and loops about the x-axis in a circular
pattern at a 10 meter diamter circle yet no forces are applied to the
rod to make it continue in this circular pattern. Or in this posting
where as tension on a straight wire increases the center of the wire
moves away from a straight line. This is opposite to typical
experiences - wires form straight lines when stretched from two points
with nothing in between them to interfere with the straight line. This
does not make sense to David.

David is accustomed to more educated people pointing out the errors in
his understanding. David really doesn't care whether others think
he's a troll, a moron, a psychologist perform tests, fat, skinny, ugly
or anything else for that matter. David simply finds relativity
interesting but seeks out the help of others in resolving things that
don't make sense to him. He finds it interesting that posters spend
time speculating about his motives but he doesn't find it helpful to
himself or others who may not understand the answers. If the problems
are so uninteresting as one person has posted here why does he read
David's postings? If the answers are so obvious why not simply post
the correct interpretation and help everyone? Why do you care about
David's motives?
David

Martin Hogbin

.

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