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Groups > sci.physics.relativity > #579795
| From | Thomas Heger <ttt_heg@web.de> |
|---|---|
| Newsgroups | sci.physics.relativity |
| Subject | Re: New rewritten version of 'annotated version of SRT' |
| Date | 2022-03-08 21:04 +0100 |
| Message-ID | <j8pr6cFa5n3U1@mid.individual.net> (permalink) |
| References | (19 earlier) <t053dk$f7l$1@dont-email.me> <j8mufeFnlbbU1@mid.individual.net> <t05n0c$gnf$1@gioia.aioe.org> <j8oc07F19itU1@mid.individual.net> <t073dd$1tq4$1@gioia.aioe.org> |
Am 08.03.2022 um 09:16 schrieb Michael Moroney: ... >>>> If no particular sign is mentioned for multiplication between vectors, >>>> the scalar product is assumed. >>>> >>>> But in this case some equations become wrong. >>> >>> Like what? >> >> Actually the problem was omnipresent. >> >> But I can take one example, which is on page 23 the second last >> equation of the entire text. >> >> It says: >> >> -d²y/dt²=epsilon/m* v/c * N * sqrt(1- v²/c²) >> >> >> Now I wrote * for multiplication, while Einstein wrote no such signs. > > Which is common, especially in the form shown (I'm looking at > https://www.fourmilab.ch/etexts/einstein/specrel/www/) Sure, the * sign was added by me for illustration purposes only. The * is often left away, because no sign means multiplication by default. And multiplication of vectors means scalar multiplication by default, unless you write e.g. an 'x', if you want a cross product. >> >> This will be interpreted as scalar multiplication. >> >> So we have a subpart '...vN...' in this equation. >> >> since v is a vector and N, too, we have a scalar product of two >> perpendicular vectors, what is zero. > > No, he is using scalars throughout. He is using the simplification that > the electron is moving along the X axis of K as is the other frame. He > treats v as a scalar speed (though translated as velocity) plus the > equation under the square root radical makes no sense if v is a vector. If he wanted to treat velocity as a scalar, he had to write that. Possibly he could have mentioned amount or similar. But there are some physical quantities, which are always regarded as vectors. Here we have: force, velocity, acceleration, electric and magnetic field strength. Without comment, these quantities are vector quantities. If you want to use a scalar like speed, you have to explicitly say so. Einstein's notation would be marked as error in any possible circumstances in colledge physics. But Einstein's error is actually high-school level, not even university. > In § 7 he describes N as the third (z) component of a magnetic vector > (L, M, N), thus a scalar, plus explicitly stating it is at a right > angle. He also uses the scalar d²x/dt² form not the partial delta form > 𝛿²x/𝛿t² for the second vector derivative. Nor would 1/N make sense in Sure. But his name for the z-component of the magnetic field strength vector was 'N'. Better would have been a name like B_z or similar. He also called the magnetic field itself 'N', even if a vector component is not a field or a force or whatever else Einstein had in mind, because as Einstein wrote it, N would be a number. But at least N should be a vector, because the particualr case was about sideways acceleration of an electron passing by along the x-axis. Since the path of the electron gets curved into the xy-plane, we need actually a vector (and not just a number) to generate this curvature. > the next equation if N was a vector. > > So once again, an "error" you found was your own misunderstanding. >> >> That would say, that acceleration in the y direction is zero (what is >> wrong). > > It is you who is wrong, of course. I'm wrong by default, while Einstein is correct for the same reason. ... TH
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Re: New rewritten version of 'annotated version of SRT' Thomas Heger <ttt_heg@web.de> - 2022-03-03 09:58 +0100
Re: New rewritten version of 'annotated version of SRT' Mikko <mikko.levanto@iki.fi> - 2022-03-03 11:32 +0200
Re: New rewritten version of 'annotated version of SRT' Thomas Heger <ttt_heg@web.de> - 2022-03-04 08:41 +0100
Re: New rewritten version of 'annotated version of SRT' Michael Moroney <moroney@world.std.spaamtrap.com> - 2022-03-04 09:57 -0500
Re: New rewritten version of 'annotated version of SRT' Mikko <mikko.levanto@iki.fi> - 2022-03-04 19:27 +0200
Re: New rewritten version of 'annotated version of SRT' Thomas Heger <ttt_heg@web.de> - 2022-03-05 20:16 +0100
Re: New rewritten version of 'annotated version of SRT' Mikko <mikko.levanto@iki.fi> - 2022-03-06 12:08 +0200
Re: New rewritten version of 'annotated version of SRT' Thomas Heger <ttt_heg@web.de> - 2022-03-06 21:20 +0100
Re: New rewritten version of 'annotated version of SRT' Python <python@example.invalid> - 2022-03-06 21:55 +0100
Re: New rewritten version of 'annotated version of SRT' Maciej Wozniak <maluwozniak@gmail.com> - 2022-03-06 22:04 -0800
Re: New rewritten version of 'annotated version of SRT' Mikko <mikko.levanto@iki.fi> - 2022-03-07 16:04 +0200
Re: New rewritten version of 'annotated version of SRT' Thomas Heger <ttt_heg@web.de> - 2022-03-07 18:42 +0100
Re: New rewritten version of 'annotated version of SRT' Michael Moroney <moroney@world.std.spaamtrap.com> - 2022-03-07 14:38 -0500
Re: New rewritten version of 'annotated version of SRT' Thomas Heger <ttt_heg@web.de> - 2022-03-08 07:39 +0100
Re: New rewritten version of 'annotated version of SRT' Michael Moroney <moroney@world.std.spaamtrap.com> - 2022-03-08 03:16 -0500
Re: New rewritten version of 'annotated version of SRT' Thomas Heger <ttt_heg@web.de> - 2022-03-08 21:04 +0100
Re: New rewritten version of 'annotated version of SRT' Odd Bodkin <bodkinodd@gmail.com> - 2022-03-08 21:10 +0000
Re: New rewritten version of 'annotated version of SRT' Thomas Heger <ttt_heg@web.de> - 2022-03-09 06:45 +0100
Re: New rewritten version of 'annotated version of SRT' Odd Bodkin <bodkinodd@gmail.com> - 2022-03-09 14:13 +0000
Re: New rewritten version of 'annotated version of SRT' Thomas Heger <ttt_heg@web.de> - 2022-03-10 07:57 +0100
Re: New rewritten version of 'annotated version of SRT' Michael Moroney <moroney@world.std.spaamtrap.com> - 2022-03-10 03:36 -0500
Re: New rewritten version of 'annotated version of SRT' "Paul B. Andersen" <paul.b.andersen@paulba.no> - 2022-03-10 12:46 +0100
Re: New rewritten version of 'annotated version of SRT' Odd Bodkin <bodkinodd@gmail.com> - 2022-03-10 11:48 +0000
Re: New rewritten version of 'annotated version of SRT' Thomas Heger <ttt_heg@web.de> - 2022-03-11 06:57 +0100
Re: New rewritten version of 'annotated version of SRT' Odd Bodkin <bodkinodd@gmail.com> - 2022-03-11 13:03 +0000
Re: New rewritten version of 'annotated version of SRT' Thomas Heger <ttt_heg@web.de> - 2022-03-12 08:34 +0100
Re: New rewritten version of 'annotated version of SRT' Odd Bodkin <bodkinodd@gmail.com> - 2022-03-12 15:06 +0000
Re: New rewritten version of 'annotated version of SRT' Thomas Heger <ttt_heg@web.de> - 2022-03-13 08:54 +0100
Re: New rewritten version of 'annotated version of SRT' Michael Moroney <moroney@world.std.spaamtrap.com> - 2022-03-13 04:14 -0400
Re: New rewritten version of 'annotated version of SRT' Thomas Heger <ttt_heg@web.de> - 2022-03-13 10:11 +0100
Re: New rewritten version of 'annotated version of SRT' Michael Moroney <moroney@world.std.spaamtrap.com> - 2022-03-13 20:35 -0400
Re: New rewritten version of 'annotated version of SRT' Thomas Heger <ttt_heg@web.de> - 2022-03-14 10:33 +0100
Re: New rewritten version of 'annotated version of SRT' Michael Moroney <moroney@world.std.spaamtrap.com> - 2022-03-14 13:37 -0400
Re: New rewritten version of 'annotated version of SRT' Odd Bodkin <bodkinodd@gmail.com> - 2022-03-13 18:32 +0000
Re: New rewritten version of 'annotated version of SRT' Thomas Heger <ttt_heg@web.de> - 2022-03-14 10:09 +0100
Re: New rewritten version of 'annotated version of SRT' Odd Bodkin <bodkinodd@gmail.com> - 2022-03-14 10:01 +0000
Re: New rewritten version of 'annotated version of SRT' Python <python@example.invalid> - 2022-03-11 16:04 +0100
Re: New rewritten version of 'annotated version of SRT' Maciej Wozniak <maluwozniak@gmail.com> - 2022-03-11 11:06 -0800
Re: New rewritten version of 'annotated version of SRT' Thomas Heger <ttt_heg@web.de> - 2022-03-12 08:10 +0100
Re: New rewritten version of 'annotated version of SRT' Python <python@example.invalid> - 2022-03-12 15:24 +0100
Re: New rewritten version of 'annotated version of SRT' Maciej Wozniak <maluwozniak@gmail.com> - 2022-03-12 08:09 -0800
Re: New rewritten version of 'annotated version of SRT' Python <python@example.invalid> - 2022-03-12 17:12 +0100
Re: New rewritten version of 'annotated version of SRT' Maciej Wozniak <maluwozniak@gmail.com> - 2022-03-12 08:37 -0800
Re: New rewritten version of 'annotated version of SRT' Python <python@example.invalid> - 2022-03-13 02:32 +0100
Re: New rewritten version of 'annotated version of SRT' Maciej Wozniak <maluwozniak@gmail.com> - 2022-03-12 21:08 -0800
Re: New rewritten version of 'annotated version of SRT' Thomas Heger <ttt_heg@web.de> - 2022-03-13 09:13 +0100
Re: New rewritten version of 'annotated version of SRT' Python <python@example.invalid> - 2022-03-13 13:42 +0100
Re: New rewritten version of 'annotated version of SRT' Maciej Wozniak <maluwozniak@gmail.com> - 2022-03-13 13:50 -0700
Re: New rewritten version of 'annotated version of SRT' Python <python@example.invalid> - 2022-03-13 22:38 +0100
Re: New rewritten version of 'annotated version of SRT' Maciej Wozniak <maluwozniak@gmail.com> - 2022-03-13 22:13 -0700
Re: New rewritten version of 'annotated version of SRT' Richard Hachel <r.hachel@tiscali.fr> - 2022-03-14 12:09 +0000
Re: New rewritten version of 'annotated version of SRT' Maciej Wozniak <maluwozniak@gmail.com> - 2022-03-14 05:29 -0700
Re: New rewritten version of 'annotated version of SRT' Thomas Heger <ttt_heg@web.de> - 2022-03-14 10:46 +0100
Re: New rewritten version of 'annotated version of SRT' Michael Moroney <moroney@world.std.spaamtrap.com> - 2022-03-14 11:58 -0400
Re: New rewritten version of 'annotated version of SRT' Odd Bodkin <bodkinodd@gmail.com> - 2022-03-13 18:32 +0000
Re: New rewritten version of 'annotated version of SRT' Thomas Heger <ttt_heg@web.de> - 2022-03-14 10:50 +0100
Re: New rewritten version of 'annotated version of SRT' "Paul B. Andersen" <paul.b.andersen@paulba.no> - 2022-03-12 21:17 +0100
Re: New rewritten version of 'annotated version of SRT' Vaugn Rhea <var@bfrlsr.ni> - 2022-03-13 00:06 +0000
Re: New rewritten version of 'annotated version of SRT' Thomas Heger <ttt_heg@web.de> - 2022-03-13 09:28 +0100
Re: New rewritten version of 'annotated version of SRT' Python <python@example.invalid> - 2022-03-13 12:45 +0100
Re: New rewritten version of 'annotated version of SRT' Maciej Wozniak <maluwozniak@gmail.com> - 2022-03-13 04:58 -0700
Re: New rewritten version of 'annotated version of SRT' Python <python@example.invalid> - 2022-03-13 13:01 +0100
Re: New rewritten version of 'annotated version of SRT' "Paul B. Andersen" <paul.b.andersen@paulba.no> - 2022-03-13 14:39 +0100
Re: New rewritten version of 'annotated version of SRT' Thomas Heger <ttt_heg@web.de> - 2022-03-14 11:00 +0100
Re: New rewritten version of 'annotated version of SRT' Michael Moroney <moroney@world.std.spaamtrap.com> - 2022-03-14 12:27 -0400
Re: New rewritten version of 'annotated version of SRT' "Paul B. Andersen" <paul.b.andersen@paulba.no> - 2022-03-14 21:00 +0100
Re: New rewritten version of 'annotated version of SRT' Thomas Heger <ttt_heg@web.de> - 2022-03-14 08:58 +0100
Re: New rewritten version of 'annotated version of SRT' "Paul B. Andersen" <paul.b.andersen@paulba.no> - 2022-03-14 19:15 +0100
Re: New rewritten version of 'annotated version of SRT' Richard Hachel <r.hachel@tiscali.fr> - 2022-03-14 12:18 +0000
Re: New rewritten version of 'annotated version of SRT' Michael Moroney <moroney@world.std.spaamtrap.com> - 2022-03-08 19:15 -0500
Re: New rewritten version of 'annotated version of SRT' Mikko <mikko.levanto@iki.fi> - 2022-03-08 11:10 +0200
Re: New rewritten version of 'annotated version of SRT' Thomas Heger <ttt_heg@web.de> - 2022-03-08 21:17 +0100
Nazi cretin Thomas Heger eats shit "Dono." <eggy20011951@gmail.com> - 2022-03-08 14:50 -0800
Re: New rewritten version of 'annotated version of SRT' Mikko <mikko.levanto@iki.fi> - 2022-03-09 15:40 +0200
Re: New rewritten version of 'annotated version of SRT' Thomas Heger <ttt_heg@web.de> - 2022-03-10 08:04 +0100
Re: New rewritten version of 'annotated version of SRT' Mikko <mikko.levanto@iki.fi> - 2022-03-10 10:40 +0200
Re: New rewritten version of 'annotated version of SRT' Thomas Heger <ttt_heg@web.de> - 2022-03-11 07:10 +0100
Re: New rewritten version of 'annotated version of SRT' Odd Bodkin <bodkinodd@gmail.com> - 2022-03-11 13:52 +0000
Re: New rewritten version of 'annotated version of SRT' Thomas Heger <ttt_heg@web.de> - 2022-03-12 08:42 +0100
Re: New rewritten version of 'annotated version of SRT' Vaugn Rhea <var@bfrlsr.ni> - 2022-03-12 22:29 +0000
Re: New rewritten version of 'annotated version of SRT' Michael Moroney <moroney@world.std.spaamtrap.com> - 2022-03-12 20:43 -0500
Re: New rewritten version of 'annotated version of SRT' Jessie Breit <jbre@yahoo.com> - 2022-03-13 20:15 +0000
Re: New rewritten version of 'annotated version of SRT' Vaugn Rhea <var@bfrlsr.ni> - 2022-03-12 22:46 +0000
Re: New rewritten version of 'annotated version of SRT' Paul Alsing <pnalsing@gmail.com> - 2022-03-12 16:51 -0800
Re: New rewritten version of 'annotated version of SRT' Vaugn Rhea <var@bfrlsr.ni> - 2022-03-13 01:03 +0000
Re: New rewritten version of 'annotated version of SRT' "Dono." <eggy20011951@gmail.com> - 2022-03-11 07:35 -0800
Re: New rewritten version of 'annotated version of SRT' nospam@de-ster.demon.nl (J. J. Lodder) - 2022-03-03 12:09 +0100
Re: New rewritten version of 'annotated version of SRT' JanPB <filmart@gmail.com> - 2022-03-03 15:33 -0800
Re: New rewritten version of 'annotated version of SRT' Maciej Wozniak <maluwozniak@gmail.com> - 2022-03-03 21:42 -0800
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