THE BEST EXPLANATION OF LENGTH CONTRACTION

Hypnotists in Einstein criminal cult often hint that, by using
Einstein's 1905 false light postulate, they can trap a long train
inside a short tunnel:

http://www.youtube.com/watch?v=VSRIy...related&search

and also a 80m long pole inside a 40m long barn:

http://www.math.ucr.edu/home/baez/ph...barn_pole.html
"These are the props. You own a barn, 40m long, with automatic doors
at either end, that can be opened and closed simultaneously by a
switch. You also have a pole, 80m long, which of course won't fit in
the barn....So, as the pole passes through the barn, there is an
instant when it is completely within the barn. At that instant, you
close both doors simultaneously, with your switch. Of course, you open
them again pretty quickly, but at least momentarily you had the
contracted pole shut up in your barn."

However in the end hypnotists always confuse the breathtaking news as
in the above case where it is not at all clear why the doors should be
reopened "pretty quickly" once the 80m long pole is safely trapped
inside the 40m long barn. Only an extremely silly zombie can explain
the miracle without any confusion:

http://groups.google.com/group/sci.p...579628f39e93d?
Tom Roberts, Mar 5, 2008:
Dono wrote:
I am not denying length contraction,

So take it one step at a time:

Since you accept length contraction, in the barn frame the pole will
be measured to be shorter than its proper length.

In the barn frame, that measurement must be made simultaneously at the
two ends of the pole (because the pole is moving relative to the barn
frame).

In the barn frame, at the instant when the two ends of the pole are
measured, we know that the pole is located entirely between its two
endpoints.

Therefore, at the instant the measurement is made in the barn frame,
there could be two closed doors at rest in the barn frame and outside
the region between the pole's endpoints -- these doors would not
intersect the pole at this instant.

Since you accept length contraction, for a large enough speed of the
pole relative to the barn frame, at the instant of measurement it is
possible for the two endpoints plus the two closed doors to all be
closer together than the proper length of the pole.

Here is a drawing at the instant of measurement in the barn frame
(note the pole is not at rest in this frame, so its proper length is
for reference only):

proper length of pole (for reference only)
-------------------------------------------------------

| ------------------------- |
Door1 measured length of pole Door2

Now it's just engineering to make the doors open and close fast enough
to "trap" the pole in between the two closed doors, as in my earlier
scenario. As this is a gedanken, we simply accept such engineering as
possible and move on.

Tom Roberts
__________________________________
[end of Tom Roberts' explanation]

Pentcho Valev

Pentcho Valev wrote:
Hypnotists in Einstein *criminal* *cult* often hint that, by using
Einstein's 1905 false light postulate, they can trap a long train
inside a short tunnel:


Quotation of Wikipedia ("A Canticle for Leibowitz", Walter M. Miller) :

"A Canticle for Leibowitz opens 600 years after 20th century
civilization is destroyed by a global nuclear war, known as the "Flame
Deluge". The text reveals that as a result of the war there was a
violent backlash *against* the *culture* of *advanced* *knowledge* and
*technology* that had led to the development of nuclear weapons. During
this backlash, called the *"Simplification"* , anyone of learning, and
eventually anyone who could even read, was likely *to* *be* *killed* by
rampaging mobs. Illiteracy became almost universal, and books were
destroyed en masse."

We have recognized Pentcho Valev : one of the first *Simplificators*
trying to kill scientific culture and "men of learning", trying to
"destroy books /en masse/" !...

RJ

A disciple of Leibowitz...!

On Mar 5, 3:18*pm, "R. Josh iii" wrote:
Pentcho Valev wrote:
Hypnotists in Einstein *criminal* *cult* often hint that, by using
Einstein's 1905 false light postulate, they can trap a long train
inside a short tunnel:

Quotation of Wikipedia ("A Canticle for Leibowitz", Walter M. Miller) :

"A Canticle for Leibowitz opens 600 years after 20th century
civilization is destroyed by a global nuclear war, known as the "Flame
Deluge". The text reveals that as a result of the war there was a
violent backlash *against* the *culture* of *advanced* *knowledge* and
*technology* that had led to the development of nuclear weapons. During
this backlash, called the *"Simplification"* , anyone of learning, and
eventually anyone who could even read, was likely *to* *be* *killed* by
rampaging mobs. Illiteracy became almost universal, and books were
destroyed en masse."

We have recognized Pentcho Valev : one of the first *Simplificators*
trying to kill scientific culture and "men of learning", trying to
"destroy books /en masse/" !...

RJ

A disciple of Leibowitz...!

Whe have already discussed that, tres cher R. Josh 3-(2+1) the
Disciple. Tu as ecrit:

R. Josh 3-(2+1) the Disciple: "Ne perdons pas notre temps avec les
barbares se préparant à détruire les acquis de la culture scientifique
(et autres) de notre civilisation, ou de ce qui en reste. Luttons, si
c'est possible, contre l'obscurantisme qui monte dans nos sociétés, à
commencer par le cadre de notre système "éducatif" public!"

Mais je t'ai explique que l'obscurantisme et les obscurantistes (moi
et les autres) etaient deja la, la lumiere appelee "Einstein"
n'existait plus et que c'etait la chanson de Gollum que tu devais
apprendre par coeur et chanter sans cesse, tres cher R. Josh 3-(2+1)
the Disciple:

http://www.youtube.com/watch?v=p8T3IxGOHHY
Where once was light
Now darkness falls
Where once was love
Love is no more
.......................
And you will weep
When you face the end alone
You are lost
You can never go home
You are lost
You can never go home

Pentcho Valev

On Mar 5, 10:15 am, "R. Josh iii" wrote:
Pentcho Valev wrote:
Mais je t'ai explique que l'obscurantisme et les obscurantistes (moi
et les autres) etaient deja la, la lumiere appelee "Einstein"
n'existait plus et que c'etait la chanson de Gollum que tu devais
apprendre par coeur et chanter sans cesse, tres cher R. Josh 3-(2+1)
the Disciple:

Cher imbécile,

Je ne suis pas disciple d'Einstein, mais de Leibowitz, contrebandier en
livres...!
Et toi, tu es un destructeur de culture scientifique, tu cherches à
brûler les livres... et les gens porteurs de connaissances, sur lesquels
tu appelles la vindicte populaire ("culte criminel", etc.)
J'emmerde Gollum et ses comparses, et toi avec !

Je pense que toi et les "Simplificateurs", vous gagnerez, vue la
connerie de l'Homo sapiens dans son ensemble...
Mais en attendant, je t'emmerde !

RJ



:-) :-)

Pentcho Valev wrote:

Mais je t'ai explique que l'obscurantisme et les obscurantistes (moi
et les autres) etaient deja la, la lumiere appelee "Einstein"
n'existait plus et que c'etait la chanson de Gollum que tu devais
apprendre par coeur et chanter sans cesse, tres cher R. Josh 3-(2+1)
the Disciple:

Cher imbécile,

Je ne suis pas disciple d'Einstein, mais de Leibowitz, contrebandier en
livres...!
Et toi, tu es un destructeur de culture scientifique, tu cherches à
brûler les livres... et les gens porteurs de connaissances, sur lesquels
tu appelles la vindicte populaire ("culte criminel", etc.)
J'emmerde Gollum et ses comparses, et toi avec !

Je pense que toi et les "Simplificateurs", vous gagnerez, vue la
connerie de l'Homo sapiens dans son ensemble...
Mais en attendant, je t'emmerde !

RJ

On Mar 5, 8:15 pm, "R. Josh iii" wrote:
Pentcho Valev wrote:
Mais je t'ai explique que l'obscurantisme et les obscurantistes (moi
et les autres) etaient deja la, la lumiere appelee "Einstein"
n'existait plus et que c'etait la chanson de Gollum que tu devais
apprendre par coeur et chanter sans cesse, tres cher R. Josh 3-(2+1)
the Disciple:

Cher imbécile,

Je ne suis pas disciple d'Einstein, mais de Leibowitz, contrebandier en
livres...!
Et toi, tu es un destructeur de culture scientifique, tu cherches à
brûler les livres... et les gens porteurs de connaissances, sur lesquels
tu appelles la vindicte populaire ("culte criminel", etc.)
J'emmerde Gollum et ses comparses, et toi avec !

Je pense que toi et les "Simplificateurs", vous gagnerez, vue la
connerie de l'Homo sapiens dans son ensemble...
Mais en attendant, je t'emmerde !

RJ

Oui mon cher R. Josh 3-(2+1) le Disciple, nous les obscurantistes et
les simplificateurs gagnerons! Et nous brulerons tous les livres ou
tes Maitres Lumineux considerent la contraction des longueurs ou bien
comme un effet reel ou bien comme un effet de perspective spatio-
temporelle:

http://www.academie-sciences.fr/MEMB...ein_Damour.pdf
Maitre Thibault Damour: "La contraction des longueurs avait, avant
Einstein, été considérée par George Fitzgerald et Hendrik Lorentz.
Cependant, ils la considéraient comme un effet réel de contraction
dans l'espace absolu, alors que pour Einstein il s'agit d'un effet
de perspective spatio-temporelle."

Car, mon cher R. Josh 3-(2+1) le Disciple, nous voulons vivre dans un
monde tenebreux et simplifie ou il n'y a aucune contraction des
longueurs! Les obscurantistes et les simplificateurs disent: A bas la
contraction des longueurs!

Pentcho Valev

http://www.albinoblacksheep.com/flash/youare

Pentcho Valev a écrit :

Car, mon cher R. Josh 3-(2+1) le Disciple, nous voulons vivre dans un

monde tenebreux et simplifie ou il n'y a aucune contraction des
longueurs! Les obscurantistes et les simplificateurs disent: A bas la
contraction des longueurs!

La notion de contraction des longueurs est une notion assez cohérente qui se
déduit de la réfutation de toute "simultanéité absolue".

Si deux observateurs ont des notions différentes de la "simultanéité"
de deux points différents présents dans leur référentiel, prenons par exemple
ce point A et ce point B sur une voie ferrée, il vient facilement que
la longueur du train va être différente selon les différents observateurs.

Ce n'est pas que le train soit plus grand ou plus petit (dans son référentiel
le train ne se trouve en rien changé, pas plus que sa masse), mais un observateur
placé ailleurs pourra penser que le train est plus grand (j'ai bien écrit plus grand)
ou plus petit qu'un observateur placé dans le train.

Je ne vois pas où est le problème.

Selon la position et la vitesse de l'observateur par rapport au train, on a:
L' = L.sqrt(1-Vo^2/c^2)/(1+cosµ.Vo/c)

C'est un effet de perspective spatio-temporelle.

Sur ça, Einstein a raison.



Pentcho Valev


R.H.

On 5 Mrz., 08:26, Pentcho Valev wrote:
Hypnotists in Einstein criminal cult often hint that, by using
Einstein's 1905 false light postulate, they can trap a long train
inside a short tunnel:

http://www.youtube.com/watch?v=VSRIy...related&search

and also a 80m long pole inside a 40m long barn:

http://www.math.ucr.edu/home/baez/ph...barn_pole.html
"These are the props. You own a barn, 40m long, with automatic doors
at either end, that can be opened and closed simultaneously by a
switch. You also have a pole, 80m long, which of course won't fit in
the barn....So, as the pole passes through the barn, there is an
instant when it is completely within the barn. At that instant, you
close both doors simultaneously, with your switch. Of course, you open
them again pretty quickly, but at least momentarily you had the
contracted pole shut up in your barn."

However in the end hypnotists always confuse the breathtaking news as
in the above case where it is not at all clear why the doors should be
reopened "pretty quickly" once the 80m long pole is safely trapped
inside the 40m long barn. Only an extremely silly zombie can explain
the miracle without any confusion:

http://groups.google.com/group/sci.p...rowse_frm/thre...
Tom Roberts, Mar 5, 2008:

Dono wrote:
I am not denying length contraction,

So take it one step at a time:

Since you accept length contraction, in the barn frame the pole will
be measured to be shorter than its proper length.

In the barn frame, that measurement must be made simultaneously at the
two ends of the pole (because the pole is moving relative to the barn
frame).

In the barn frame, at the instant when the two ends of the pole are
measured, we know that the pole is located entirely between its two
endpoints.

Therefore, at the instant the measurement is made in the barn frame,
there could be two closed doors at rest in the barn frame and outside
the region between the pole's endpoints -- these doors would not
intersect the pole at this instant.

Since you accept length contraction, for a large enough speed of the
pole relative to the barn frame, at the instant of measurement it is
possible for the two endpoints plus the two closed doors to all be
closer together than the proper length of the pole.

Here is a drawing at the instant of measurement in the barn frame
(note the pole is not at rest in this frame, so its proper length is
for reference only):

proper length of pole (for reference only)
-------------------------------------------------------

| ------------------------- |
Door1 measured length of pole Door2

Now it's just engineering to make the doors open and close fast enough
to "trap" the pole in between the two closed doors, as in my earlier
scenario. As this is a gedanken, we simply accept such engineering as
possible and move on.

Tom Roberts
__________________________________
[end of Tom Roberts' explanation]

Pentcho Valev


I'm not good in understanding SR.
I only want to know if I look to the situation from the pole's frame:
So the distance between the barn doors is in any case too short, that
the pole can fit into the barn.
SR is symmetrical for time dilatation and length contraction, but not
for this situation.
Who can help me out.

Pentcho Valev wrote:

Oui mon cher R. Josh 3-(2+1) le Disciple, nous les obscurantistes et
les simplificateurs gagnerons! Et *nous* *brulerons* *tous* *les* *livres* ou
tes Maitres Lumineux considerent la contraction des longueurs ou bien
comme un effet reel ou bien comme un effet de perspective spatio-
temporelle:

*Aveu* du Peine-Chaud Valet Obscurantiste et Simplificateur qu'il est un
*destructeur* de *livres* !!!

C'est le pire des crimes contre la culture et la civilisation.

Pentcho the Barbarian !

RJ