Re: Unravelling the mysteries of coiling ropes


"Edward Green" <spamspamspam3@xxxxxxxxxxx> wrote in message
news:1193604596.240587.112600@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
: On Oct 26, 12:14 am, Sam Wormley <sworml...@xxxxxxxxx> wrote:
: > Unravelling the mysteries of coiling ropes
: >
http://physicsworld.com/cws/article/news/31564;jsessionid=F2B86CF9053...
: >
: > If you carefully lower a rope onto the floor it will probably form a
: > neat coil. While most people wouldn't give this a second thought, an
: > international team of physicists has done a series of experiments and
: > numerical simulations to work out why. Their new insights into
: > coiling could shed light on the behaviour of an important class of
: > materials called "elastic ropes", which includes DNA molecules and
: > structural reinforcing rods in buildings (Phys. Rev. Lett. 99
: > 154302).
: >
: > Neil Ribe at the University of Paris-7 and colleagues in Iran and the
: > Netherlands used a reel powered by an electric motor to feed ordinary
: > rope or thread down through a hole and onto a glass or paper plate
: > below. The rate of descent and the distance between the reel and the
: > plate could be changed, allowing the team to study coiling over a
: > wide range of speeds and drop lengths. A second set of similar
: > experiments looked at the coiling of soft strands of spaghetti.
: >
: > Ribe told physicsworld.com that the team is the first to perform
: > controlled lab experiments on coiling and their use of different
: > materials allowed them to build up a comprehensive understanding of
: > why some ropes coil and others don't.
: >
: > According to Ribe, one surprise result is that the coiling always
: > occurred at several different "frequencies" for fixed values of the
: > feed rate and fall distance. These frequencies correspond to the
: > vibrational modes of the nearly vertical upper part of the falling
: > rope. They discovered that coiling occurs when any of these
: > frequencies matches the angular frequency at which bottom end of the
: > rope whirls into a coil.
:
: What is a "frequency", and how does it differ from a frequency?

What is a "time", and how does it differ from a time?

'we establish by definition that the "time" required by
light to travel from A to B equals the "time" it requires
to travel from B to A' because I SAY SO and you have to
agree because I'm the great genius, STOOOPID, don't you
dare question it. -- Rabbi Albert Einstein



http://www.androcles01.pwp.blueyonder.co.uk/Smart/tAB=tBA.gif


"I know that in the past Androcles has used tAB=tBA to
claim Einstein thinks tau_AB = tau_BA (the travel
times in the frame in which the clocks at A and B are
moving)." -- Blind "I'm not a troll" Poe.
http://www.fourmilab.ch/etexts/einstein/specrel/www/figures/img21.gif


"Neither [frame] is stationary, which is your problem." -- Blind
"I'm not a troll" Poe.
Ref: news:1189468758.944626.39450@xxxxxxxxxxxxxxxxxxxxxxxxxxxx



'we establish by definition that the "time" required by
light to travel from A to B doesn't equal the "time" it requires
to travel from B to A in the stationary system, obviously.' --
Heretic Jan Bielawski, assistant light-bulb changer.

Ref: news:1188363019.673281.67710@xxxxxxxxxxxxxxxxxxxxxxxxxxxx


"SR is GR with G=0." -- Uncle Stooopid.

The Uncle Stooopid doctrine:
http://sound.westhost.com/counterfeit.jpg

"What can be asserted without evidence can also be dismissed without
evidence." -- Uncle Stooopid.


"Counterfactual assumptions yield nonsense.
If such a thing were actually observed, reliably and reproducibly, then
relativity would immediately need a major overhaul if not a complete
replacement." -- Humpty Roberts.

Rabbi Albert Einstein in 1895 failed an examination that would
have allowed him to study for a diploma as an electrical engineer
at the Eidgenössische Technische Hochschule in Zurich
(couldn't even pass the SATs).

According to Phuckwit Duck it was geography and history that Einstein
failed on, as if Eidgenössische Technische Hochschule would give a
damn. That tells you the lengths these lying bastards will go to to
protect their tin god, but its always a laugh when they slip up.
Trolls, the lot of them.

"This is PHYSICS, not math or logic, and "proof" is completely
irrelevant." -- Humpty Roberts.





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