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Groups > sci.physics.relativity > #428677 > unrolled thread
| Started by | Luigi Fortunati <fortunati.luigi@gmail.com> |
|---|---|
| First post | 2017-08-14 17:32 +0200 |
| Last post | 2017-08-18 23:39 +0200 |
| Articles | 4 on this page of 84 — 11 participants |
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The train on the mined bridge Luigi Fortunati <fortunati.luigi@gmail.com> - 2017-08-14 17:32 +0200
Re: The train on the mined bridge rotchm <rotchm@gmail.com> - 2017-08-14 08:59 -0700
Re: The train on the mined bridge Paparios <mrios@ing.puc.cl> - 2017-08-14 08:59 -0700
Re: The train on the mined bridge rotchm <rotchm@gmail.com> - 2017-08-14 09:00 -0700
Re: The train on the mined bridge Luigi Fortunati <fortunati.luigi@gmail.com> - 2017-08-14 18:35 +0200
Re: The train on the mined bridge rotchm <rotchm@gmail.com> - 2017-08-14 09:41 -0700
Re: The train on the mined bridge Luigi Fortunati <fortunati.luigi@gmail.com> - 2017-08-14 21:35 +0200
Re: The train on the mined bridge rotchm <rotchm@gmail.com> - 2017-08-15 06:33 -0700
Re: The train on the mined bridge Luigi Fortunati <fortunati.luigi@gmail.com> - 2017-08-15 17:18 +0200
Re: The train on the mined bridge rotchm <rotchm@gmail.com> - 2017-08-15 08:35 -0700
Re: The train on the mined bridge moroney@world.std.spaamtrap.com (Michael Moroney) - 2017-08-14 20:09 +0000
Re: The train on the mined bridge Luigi Fortunati <fortunati.luigi@gmail.com> - 2017-08-14 22:35 +0200
Re: The train on the mined bridge "Dono," <sa_ge@comcast.net> - 2017-08-14 09:23 -0700
Re: The train on the mined bridge rotchm <rotchm@gmail.com> - 2017-08-14 09:33 -0700
Stephane Baune posts another cretinism "Dono," <sa_ge@comcast.net> - 2017-08-14 09:48 -0700
Re: Stephane Baune posts another cretinism rotchm <rotchm@gmail.com> - 2017-08-14 10:34 -0700
Re: The train on the mined bridge "Dono," <sa_ge@comcast.net> - 2017-08-16 07:11 -0700
Re: The train on the mined bridge Python <python@example.invalid> - 2017-08-16 16:27 +0200
Re: The train on the mined bridge "Dono," <sa_ge@comcast.net> - 2017-08-16 08:00 -0700
Re: The train on the mined bridge Odd Bodkin <bodkinodd@gmail.com> - 2017-08-16 10:20 -0500
Re: The train on the mined bridge "Dono," <sa_ge@comcast.net> - 2017-08-16 08:41 -0700
Re: The train on the mined bridge Odd Bodkin <bodkinodd@gmail.com> - 2017-08-16 10:45 -0500
Re: The train on the mined bridge "Dono," <sa_ge@comcast.net> - 2017-08-16 08:55 -0700
Re: The train on the mined bridge Odd Bodkin <bodkinodd@gmail.com> - 2017-08-16 11:05 -0500
Re: The train on the mined bridge rotchm <rotchm@gmail.com> - 2017-08-16 08:58 -0700
Imbecile Stephamr Baune at work "Dono," <sa_ge@comcast.net> - 2017-08-16 09:05 -0700
Re: Imbecile Stephamr Baune at work rotchm <rotchm@gmail.com> - 2017-08-16 10:33 -0700
Re: Imbecile Stephamr Baune exposed as a fraud "Dono," <sa_ge@comcast.net> - 2017-08-16 10:48 -0700
Re: The train on the mined bridge Tom Roberts <tjroberts137@sbcglobal.net> - 2017-08-16 22:37 -0500
Re: The train on the mined bridge rotchm <rotchm@gmail.com> - 2017-08-16 22:23 -0700
Tom Roberts chimes in (with a new imbecility) "Dono," <sa_ge@comcast.net> - 2017-08-17 06:35 -0700
Re: Poor Andrew Georges Python <python@example.invalid> - 2017-08-17 17:33 +0200
Python continues to suck "Dono," <sa_ge@comcast.net> - 2017-08-17 08:36 -0700
Re: Python continues to suck Odd Bodkin <bodkinodd@gmail.com> - 2017-08-17 10:56 -0500
Re: Andrew Georges keeps digging Python <python@example.invalid> - 2017-08-17 18:17 +0200
Python keep posting imbecilities "Dono," <sa_ge@comcast.net> - 2017-08-17 09:22 -0700
Re: Andrew Georges digging deeper and deeper Python <python@example.invalid> - 2017-08-17 18:37 +0200
Imbecile Liar Python eats (even more) shit "Dono," <sa_ge@comcast.net> - 2017-08-17 09:42 -0700
Re: Andrew George in despair Python <python@example.invalid> - 2017-08-17 18:50 +0200
Python digs deeper in his lies "Dono," <sa_ge@comcast.net> - 2017-08-17 10:12 -0700
Re: Python digs deeper in his lies rotchm <rotchm@gmail.com> - 2017-08-17 12:29 -0700
Stephane Baune posts edited quotes "Dono," <sa_ge@comcast.net> - 2017-08-17 14:39 -0700
Re: Stephane Baune posts edited quotes rotchm <rotchm@gmail.com> - 2017-08-17 16:35 -0700
Re: Stephane Baune posts edited quotes "Dono," <sa_ge@comcast.net> - 2017-08-17 16:36 -0700
Stephane Baune, lowest form of scum "Dono," <sa_ge@comcast.net> - 2017-08-17 16:35 -0700
Re: Stephane Baune, lowest form of scum rotchm <rotchm@gmail.com> - 2017-08-17 16:44 -0700
Re: Stephane Baune, lowest form of scum "Dono," <sa_ge@comcast.net> - 2017-08-17 16:46 -0700
Re: Stephane Baune, lowest form of scum rotchm <rotchm@gmail.com> - 2017-08-17 17:11 -0700
Re: Stephane Baune, lowest form of scum "Dono," <sa_ge@comcast.net> - 2017-08-17 18:48 -0700
Re: Stephane Baune, lowest form of scum rotchm <rotchm@gmail.com> - 2017-08-17 19:31 -0700
Re: Stephane Baune, lowest form of scum "Dono," <sa_ge@comcast.net> - 2017-08-17 20:14 -0700
Stephane Baune - scumbag "Dono," <sa_ge@comcast.net> - 2017-08-17 16:42 -0700
Re: Stephane Baune - scumbag rotchm <rotchm@gmail.com> - 2017-08-17 16:46 -0700
Re: Stephane Baune - scumbag "Dono," <sa_ge@comcast.net> - 2017-08-17 16:47 -0700
Re: Python digs deeper in his lies "Dono," <sa_ge@comcast.net> - 2017-08-18 07:06 -0700
Re: Andrew Georges and his cognitive disease strike again Python <python@example.invalid> - 2017-08-18 11:14 +0200
Python rushes to suck d!ck to Sttephane Baune. gain. "Dono," <sa_ge@comcast.net> - 2017-08-18 07:05 -0700
Re: Python rushes to suck d!ck to Sttephane Baune. gain. rotchm <rotchm@gmail.com> - 2017-08-18 07:18 -0700
Re: Python rushes to suck d!ck to Sttephane Baune. gain. "Dono," <sa_ge@comcast.net> - 2017-08-18 07:23 -0700
Re: Andrew Georges highly confused Python <python@example.invalid> - 2017-08-18 16:53 +0200
Python persists in his imbecility "Dono," <sa_ge@comcast.net> - 2017-08-18 07:58 -0700
Re: Python persists in his imbecility rotchm <rotchm@gmail.com> - 2017-08-18 10:58 -0700
Re: Python persists in his imbecility and Stephane Baune cranks up his dishonesty "Dono," <sa_ge@comcast.net> - 2017-08-18 12:55 -0700
Re: Python persists in his imbecility and Stephane Baune cranks up his dishonesty rotchm <rotchm@gmail.com> - 2017-08-18 13:43 -0700
Scumbag Stephane Baune digs himself deeper into his lies "Dono," <sa_ge@comcast.net> - 2017-08-18 14:31 -0700
Re: Scumbag Stephane Baune digs himself deeper into his lies rotchm <rotchm@gmail.com> - 2017-08-18 14:33 -0700
Re: Scumbag Stephane Baune digs himself deeper into his lies "Dono," <sa_ge@comcast.net> - 2017-08-18 14:36 -0700
Re: Scumbag Stephane Baune digs himself deeper into his lies rotchm <rotchm@gmail.com> - 2017-08-18 14:42 -0700
Re: Scumbag Stephane Baune digs himself deeper into his lies "Dono," <sa_ge@comcast.net> - 2017-08-18 14:53 -0700
Re: Scumbag Stephane Baune digs himself deeper into his lies rotchm <rotchm@gmail.com> - 2017-08-18 15:42 -0700
Re: Scumbag Stephane Baune digs himself deeper into his lies "Dono," <sa_ge@comcast.net> - 2017-08-18 15:47 -0700
Re: Scumbag Stephane Baune digs himself deeper into his lies Elma Sneijders <elsn@uejdui.fe> - 2017-08-18 21:40 +0000
Imbecile Python has his brain shaken by sucking up to crackpot Stephane Baune "Dono," <sa_ge@comcast.net> - 2017-08-18 07:33 -0700
Re: Andrew George half-backpedalling Python <python@example.invalid> - 2017-08-18 16:57 +0200
Python keeps eating shit "Dono," <sa_ge@comcast.net> - 2017-08-18 08:00 -0700
Re: Andrew Georges turning in circles Python <python@example.invalid> - 2017-08-18 17:06 +0200
Pythom insists on sucking up to conman Stephane Baune "Dono," <sa_ge@comcast.net> - 2017-08-18 08:37 -0700
Re: Imbecile Python has his brain shaken by sucking up to crackpot Stephane Baune rotchm <rotchm@gmail.com> - 2017-08-18 11:10 -0700
Re: The train on the mined bridge rotchm <rotchm@gmail.com> - 2017-08-16 07:37 -0700
Cretin Stephane Baune at work "Dono," <sa_ge@comcast.net> - 2017-08-16 08:01 -0700
Re: The train on the mined bridge Luigi Fortunati <fortunati.luigi@gmail.com> - 2017-08-14 18:43 +0200
Re: The train on the mined bridge "Dono," <sa_ge@comcast.net> - 2017-08-14 09:49 -0700
Re: The train on the mined bridge Sylvia Else <sylvia@not.at.this.address> - 2017-08-16 19:13 +1000
Re: The train on the mined bridge Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2017-08-18 23:39 +0200
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| From | Luigi Fortunati <fortunati.luigi@gmail.com> |
|---|---|
| Date | 2017-08-14 18:43 +0200 |
| Message-ID | <omsjv8$uv4$1@gioia.aioe.org> |
| In reply to | #428688 |
Dono, alle ore 18:23:28 del 14/08/2017 ha scritto: > If you assumed that the train is stationary and the bridge is moving with -v > you would be getting the same exact answer in both cases: no explosion since > the ends of the bridge do not coincide with the ends of the train in EITHER > of the two cases. This is the easiest solution to your exercise, requires > virtually no calculations. For the explosion it is sufficient that two points "whatever" of the train touch A and B, it is not necessary that N touch B and M touch A. -- Luigi Fortunati Credere e' piu' facile che pensare Believing is easier than thinking
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| From | "Dono," <sa_ge@comcast.net> |
|---|---|
| Date | 2017-08-14 09:49 -0700 |
| Message-ID | <6ef44b4f-5a39-4b13-a566-c31685ace910@googlegroups.com> |
| In reply to | #428696 |
On Monday, August 14, 2017 at 9:43:24 AM UTC-7, Luigi Fortunati wrote: > Dono, alle ore 18:23:28 del 14/08/2017 ha scritto: > > If you assumed that the train is stationary and the bridge is moving with -v > > you would be getting the same exact answer in both cases: no explosion since > > the ends of the bridge do not coincide with the ends of the train in EITHER > > of the two cases. This is the easiest solution to your exercise, requires > > virtually no calculations. > > For the explosion it is sufficient that two points "whatever" of the > train touch A and B, it is not necessary that N touch B and M touch A. > > -- > Luigi Fortunati > > Credere e' piu' facile che pensare > Believing is easier than thinking Then , your exercise has nothing to do with SR.
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| From | Sylvia Else <sylvia@not.at.this.address> |
|---|---|
| Date | 2017-08-16 19:13 +1000 |
| Message-ID | <evigl7Fh515U1@mid.individual.net> |
| In reply to | #428677 |
On 15/08/2017 1:32 AM, Luigi Fortunati wrote: > The AB bridge and the MN train have both their own length of 16 dashes. > > The train has the speed of gamma=2. > > Bridge AB has been mined and the contact for the explosion of the > explosive is carried out by the train itself by connecting between point > A and point B. > > So the explosion only occurs if the MN train is long enough to make > contact. > > In the (reference) frame of terrain the train is contracted to the > middle (8 dashes) and passes without closing the contact, so the > explosion does not occur: > -----------M------>N-------------------- > -----------A---------------B----------->x > > Instead in the (reference) frame of the train (long 16) is the bridge to > be contracted to the middle (8 dashes): > ---M-------------->N------------- > -----------A-------B----------->x > > And so the contact between A and B is already in this position and the > explosion takes place. > > Will the train be saved or not? > It appears you're saying that the explosion occurs if, in the frame of the bridge, there is simultaneous contact at A and B. When transformed into the frame of the train, the requirement is not for simultaneous contact, but contact at some separation in time. The explosion does not occur, and both frames agree about that. Sylvia.
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| From | Thomas 'PointedEars' Lahn <PointedEars@web.de> |
|---|---|
| Date | 2017-08-18 23:39 +0200 |
| Message-ID | <2396828.mvXUDI8C0e@PointedEars.de> |
| In reply to | #428677 |
Luigi Fortunati wrote:
> The AB bridge and the MN train have both their own length of 16 dashes.
That’s _proper_ length.
> The train has the speed of gamma=2.
The Lorentz factor (gamma) is obviously not a speed. Speed has the
dimension [length]∕[time], therefore a corresponding unit, e.g. m∕s.
The Lorentz factor has dimension 1, and obviously not a unit.
Homework assignment:
(1) Calculate the relative speed for gamma = 2.
(2) Bonus points if you can explain either why or why not a regular
train can move at that relative speed.
> Bridge AB has been mined and the contact for the explosion of the
> explosive is carried out by the train itself by connecting between
> point A and point B.
>
> So the explosion only occurs if the MN train is long enough to make
> contact.
No, it occurs if M is at A *at the same time* as N is at B.
> Will the train be saved or not?
What do you think, and why?
--
PointedEars
Twitter: @PointedEars2
Please do not cc me. / Bitte keine Kopien per E-Mail.
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