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Groups > sci.physics.relativity > #608526
| From | whodat <whodaat@void.nowgre.com> |
|---|---|
| Newsgroups | sci.physics.relativity |
| Subject | Re: Railway puzzle |
| Date | 2023-04-25 22:23 -0500 |
| Message-ID | <karjp8F23e6U1@mid.individual.net> (permalink) |
| References | (13 earlier) <242606c5-476d-45b9-80e5-9df9ea3aa703n@googlegroups.com> <1q9qsvj.zf9t21jfbjgeN%nospam@de-ster.demon.nl> <f885259c-958f-4861-b481-a6f803ed1b48n@googlegroups.com> <1q9qysq.1m9wb712vnfnmN%nospam@de-ster.demon.nl> <u2a1a2$17b3m$1@dont-email.me> |
On 4/25/2023 9:12 PM, Volney wrote:
> On 4/25/2023 5:30 PM, J. J. Lodder wrote:
>> Maciej Wozniak <maluwozniak@gmail.com> wrote:
>>
>>> On Tuesday, 25 April 2023 at 13:39:26 UTC+2, J. J. Lodder wrote:
>>>> Maciej Wozniak <maluw...@gmail.com> wrote:
>>>>
>>>>> On Tuesday, 25 April 2023 at 11:49:32 UTC+2, J. J. Lodder wrote:
>>>>>>>>> I believe that was north-south rail lines, because N/S trains
>>>>>>>>> toward the equator have a perpendicular motion of 1000 mph
>>>>>>>>> compared to a train toward the north pole.
>>>>>>>>>
>>>>>>>>> I never tried to work out whether he was correct but I do remember
>>>>>>>>> that he said it didn't matter whether the train headed north or
>>>>>>>>> south, the same rail wore more than the other.
>>>>>> [Science Quizz stuff]
>>>>>>
>>>>>> Somewhere in this world there is a stretch
>>>>>> of straight high speed railway line that is perfectly levelled.
>>>>>> (WRT to the geoid of course)
>>>>>> So the weight is equally divided over the left and right wheels,
>>>>>
>>>>> Doesn't it depend on - how a train is loaded?
>>>> Symmetrical, as implied above.
>>>>>> It is two way railway line, with separate tracks.
>>>>>>
>>>>>> Now trains start moving on it.
>>>>>> Someone says that Coriolis forces will push moving trains to one
>>>>>> side,
>>>>>> and that therefore the rails will wear unequally,
>>>>>> independently of which way the trains are going.
>>>>>> Is this true?
>>>>> Do you mean - independently of whether a train
>>>>> goes from the equator to a pole or oppositely?
>>>> Yes.
>>>>>> Choose from:
>>>>>>
>>>>>> A) No, there will be no unequal wear,
>>>>>> because Coriolis forces don't really exist.
>>>>>>
>>>>>>
>>>>>> B) Yes, there will be unequal wear,
>>>>>> and it will be on the same side on both of the tracks.
>>>>>>
>>>>>> C) Yes, there will be unequal wear,
>>>>>> and it will be on the opposite sides of the tracks.
>>>>>>
>>>>>> And next:
>>>>>> Is it the same for east-west and north-south railways?
>>>>>
>>>>> What is the wind?
>>>> Neglected,
>>>
>>> Don't think so. Assuming too much and neglecting
>>> too much is a professional sickness of physicists.
>>> For a N-S railroad in the trade wind zone I would
>>> expect the east side of rail to be worn more.
>>> And the Coriolis effect would be indeed responsible
>>> for that Did I pass your "exercise"?
>>
>> Sorry, No,
>>
>
> I found something.
>
> The Wikipedia article on the Coriolis Force has an entire section
> involving an east-west train on the equator.
>
> https://en.wikipedia.org/wiki/Coriolis_force#Intuitive_example
>
> Summary: An eastbound train has the Coriolis force pointing away from
> the axis of rotation, or up, making the eastbound train lighter than the
> stopped train. For the westbound train moving against the earth's
> rotation, the Coriolis force is downward, and would make a westbound
> train appear heavier.
>
> For a high speed object, this becomes the Eötvös effect, which causes a
> westbound projectile to be deflected downward and an eastbound
> projectile upward, when compared to the expected ballistic path ignoring
> rotation.
>
> ("Eötvös" conjures other thoughts about Uncle Al, his idée fixe about
> asymmetries had "Eötvös" in its name)
Uncle Al's as well as any other idealistic discussion about rails and
trains neglects the overwhelming irregularities attendant to the
operation of trains on standard railway tracks.
There's nothing as valuable to such discussions as watching trains
operate at various speeds. Almost as valuable is riding some trains.
I'd wager that most of the participants here have never ridden a train
let alone ridden enough trains to get a reasonable sampling of what
actually happens.
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Re: The Experiment that Resccued Einstein from Obscurity. Jane <Jane@home.com> - 2023-05-07 00:51 +0000
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Re: The Experiment that Resccued Einstein from Obscurity. Jane <Jane@home.com> - 2023-05-10 04:45 +0000
Uncle Jane Discusses Science (was Re: The Experiment that Resccued Einstein from Obscurity.) whodat <whodaat@void.nowgre.com> - 2023-05-10 00:24 -0500
Uncle Jane dodges the issues (was Re: The Experiment that Resccued Einstein from Obscurity.) whodat <whodaat@void.nowgre.com> - 2023-05-10 02:11 -0500
Re: Uncle Jane dodges the issues (was Re: The Experiment that Resccued Einstein from Obscurity.) Jane <Jane@home.com> - 2023-05-10 23:57 +0000
Re: Uncle Jane dodges the issues (was Re: The Experiment that Resccued Einstein from Obscurity.) whodat <whodaat@void.nowgre.com> - 2023-05-11 14:06 -0500
Re: Uncle Jane dodges the issues (was Re: The Experiment that Resccued Einstein from Obscurity.) Jane <Jane@home.com> - 2023-05-11 23:35 +0000
Re: Uncle Jane dodges the issues (was Re: The Experiment that Resccued Einstein from Obscurity.) whodat <whodaat@void.nowgre.com> - 2023-05-11 20:16 -0500
Re: Uncle Jane dodges the issues (was Re: The Experiment that Resccued Einstein from Obscurity.) Jane <Jane@home.com> - 2023-05-15 00:34 +0000
Re: Uncle Jane dodges the issues (was Re: The Experiment that Resccued Einstein from Obscurity.) whodat <whodaat@void.nowgre.com> - 2023-05-14 22:38 -0500
Re: Uncle Jane dodges the issues (was Re: The Experiment that Resccued Einstein from Obscurity.) Jane <Jane@home.com> - 2023-05-16 02:01 +0000
Re: Uncle Jane dodges the issues (was Re: The Experiment that Resccued Einstein from Obscurity.) whodat <whodaat@void.nowgre.com> - 2023-05-16 00:57 -0500
Re: Uncle Jane dodges the issues (was Re: The Experiment that Resccued Einstein from Obscurity.) Jane <Jane@home.com> - 2023-05-16 06:31 +0000
Re: Uncle Jane dodges the issues (was Re: The Experiment that Resccued Einstein from Obscurity.) whodat <whodaat@void.nowgre.com> - 2023-05-16 12:57 -0500
Re: Uncle Jane dodges the issues (was Re: The Experiment that Resccued Einstein from Obscurity.) Jane <Jane@home.com> - 2023-05-17 22:57 +0000
Uncle Jane's Dementia (was Re: Uncle Jane dodges the issues (was Re: The Experiment that Resccued Einstein from Obscurity.) whodat <whodaat@void.nowgre.com> - 2023-05-17 19:20 -0500
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Re: The Experiment that Resccued Einstein from Obscurity. Volney <volney@invalid.invalid> - 2023-04-24 13:10 -0400
Re: The Experiment that Resccued Einstein from Obscurity. nospam@de-ster.demon.nl (J. J. Lodder) - 2023-04-25 10:28 +0200
Re: The Experiment that Resccued Einstein from Obscurity. Maciej Wozniak <maluwozniak@gmail.com> - 2023-04-25 02:06 -0700
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Re: The Experiment that Resccued Einstein from Obscurity. Maciej Wozniak <maluwozniak@gmail.com> - 2023-04-25 02:38 -0700
Re: The Experiment that Resccued Einstein from Obscurity. nospam@de-ster.demon.nl (J. J. Lodder) - 2023-04-25 13:39 +0200
Railway puzzle (was Re: The Experiment that Resccued Einstein) nospam@de-ster.demon.nl (J. J. Lodder) - 2023-04-25 11:49 +0200
Re: Railway puzzle (was Re: The Experiment that Resccued Einstein) Maciej Wozniak <maluwozniak@gmail.com> - 2023-04-25 03:11 -0700
Re: Railway puzzle nospam@de-ster.demon.nl (J. J. Lodder) - 2023-04-25 13:39 +0200
Re: Railway puzzle Maciej Wozniak <maluwozniak@gmail.com> - 2023-04-25 05:19 -0700
Re: Railway puzzle nospam@de-ster.demon.nl (J. J. Lodder) - 2023-04-25 23:30 +0200
Re: Railway puzzle Volney <volney@invalid.invalid> - 2023-04-25 22:12 -0400
Re: Railway puzzle whodat <whodaat@void.nowgre.com> - 2023-04-25 22:23 -0500
Re: Railway puzzle Jane <Jane@home.com> - 2023-04-26 18:50 +0000
Re: Railway puzzle nospam@de-ster.demon.nl (J. J. Lodder) - 2023-04-27 09:15 +0200
Re: Railway puzzle Jane <Jane@home.com> - 2023-04-28 02:53 +0000
Re: Railway puzzle RichD <r_delaney2001@yahoo.com> - 2023-04-28 10:43 -0700
Re: Railway puzzle nospam@de-ster.demon.nl (J. J. Lodder) - 2023-04-28 22:09 +0200
Re: Railway puzzle "mitchr...@gmail.com" <mitchrae3323@gmail.com> - 2023-04-28 15:53 -0700
Re: Railway puzzle Evenezer Nigro <veor@rnigeern.ne> - 2023-04-30 16:24 +0000
Re: Railway puzzle nospam@de-ster.demon.nl (J. J. Lodder) - 2023-05-07 13:34 +0200
Re: Railway puzzle RichD <r_delaney2001@yahoo.com> - 2023-04-29 10:55 -0700
Re: Railway puzzle "mitchr...@gmail.com" <mitchrae3323@gmail.com> - 2023-04-29 11:09 -0700
Re: Railway puzzle nospam@de-ster.demon.nl (J. J. Lodder) - 2023-04-29 21:27 +0200
Re: Railway puzzle Volney <volney@invalid.invalid> - 2023-04-29 19:01 -0400
Re: Railway puzzle Athel Cornish-Bowden <athel.cb@gmail.com> - 2023-04-30 11:11 +0200
Re: Railway puzzle RichD <r_delaney2001@yahoo.com> - 2023-04-27 15:20 -0700
Re: Railway puzzle nospam@de-ster.demon.nl (J. J. Lodder) - 2023-04-28 14:18 +0200
Re: Railway puzzle nospam@de-ster.demon.nl (J. J. Lodder) - 2023-04-29 14:38 +0200
Re: Railway puzzle nospam@de-ster.demon.nl (J. J. Lodder) - 2023-04-26 23:15 +0200
Re: The Experiment that Resccued Einstein from Obscurity. Tommy Africani <ffci@tiacyctm.mo> - 2023-04-26 13:39 +0000
Re: The Experiment that Resccued Einstein from Obscurity. Mikko <mikko.levanto@iki.fi> - 2023-04-24 12:44 +0300
Re: The Experiment that Resccued Einstein from Obscurity. nospam@de-ster.demon.nl (J. J. Lodder) - 2023-04-24 17:44 +0200
Re: The Experiment that Resccued Einstein from Obscurity. Volney <volney@invalid.invalid> - 2023-04-24 13:20 -0400
Re: The Experiment that Resccued Einstein from Obscurity. Laurence Clark Crossen <l.c.crossen@hotmail.com> - 2023-04-21 12:59 -0700
Re: The Experiment that Resccued Einstein from Obscurity. Jane <Jane@home.com> - 2023-04-22 00:31 +0000
Re: The Experiment that Resccued Einstein from Obscurity. Laurence Clark Crossen <l.c.crossen@hotmail.com> - 2023-04-21 17:49 -0700
Re: The Experiment that Resccued Einstein from Obscurity. "gehan.am...@gmail.com" <gehan.ameresekere@gmail.com> - 2023-04-21 23:43 -0700
Re: The Experiment that Resccued Einstein from Obscurity. Jane <Jane@home.com> - 2023-04-22 09:42 +0000
Re: The Experiment that Resccued Einstein from Obscurity. "gehan.am...@gmail.com" <gehan.ameresekere@gmail.com> - 2023-04-22 03:30 -0700
Re: The Experiment that Resccued Einstein from Obscurity. "Dono." <eggy20011951@gmail.com> - 2023-04-22 07:01 -0700
Re: The Experiment that Resccued Einstein from Obscurity. Jane <Jane@home.com> - 2023-04-24 00:19 +0000
Re: The Experiment that Resccued Einstein from Obscurity. whodat <whodaat@void.nowgre.com> - 2023-04-24 08:37 -0500
Re: The Experiment that Resccued Einstein from Obscurity. Jane <Jane@home.com> - 2023-04-25 01:21 +0000
Re: The Experiment that Resccued Einstein from Obscurity. whodat <whodaat@void.nowgre.com> - 2023-04-25 17:41 -0500
Re: The Experiment that Resccued Einstein from Obscurity. Laurence Clark Crossen <l.c.crossen@hotmail.com> - 2023-05-06 18:01 -0700
Re: The Experiment that Resccued Einstein from Obscurity. Paul Alsing <pnalsing@gmail.com> - 2023-05-06 18:59 -0700
Re: The Experiment that Resccued Einstein from Obscurity. whodat <whodaat@void.nowgre.com> - 2023-05-06 22:36 -0500
Re: The Experiment that Resccued Einstein from Obscurity. Jane <Jane@home.com> - 2023-05-10 04:33 +0000
Re: The Experiment that Resccued Einstein from Obscurity. carl eto <ccarleto4157990662@gmail.com> - 2023-05-10 14:17 -0700
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