Re: "Time" vs "physical time"

Liste des GroupesRevenir à p relativity 
Sujet : Re: "Time" vs "physical time"
De : r.hachel (at) *nospam* jesauspu.fr (Richard Hachel)
Groupes : sci.physics.relativity
Date : 11. Aug 2024, 20:05:59
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Organisation : Nemoweb
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Le 11/08/2024 à 19:32, "Paul.B.Andersen" a écrit :
Den 10.08.2024 23:35, skrev Richard Hachel:
Le 10/08/2024 à 21:48, "Paul.B.Andersen" a écrit :
Den 08.08.2024 19:55, skrev Richard Hachel:
Can you reformulate your question using a vast underground tunnel between Paris and Oslo, in which we could launch particles at high speed from Paris to Oslo and vice versa?
 We assume that the length of the tunnel would be 1320 kms.
 
OK, let's assume that the length of the tunnel is exactly 1320 km.
We are using two clocks showing UTC+2h. But they have to be
more precisely synchronised than the clocks on the airports
which can not be expected to be synchronous to much better than
within a second.
>
So we will use two atomic clocks which are synchronised
by GPS to show UTC+2h to within 1 ns.
>
The particle we will use is a photon.
>
A photon is sent from Oslo at the time 12.00.000000000 ± 1ns
and is detected in Paris at the time   12.00.004403046 ± 1ns
The measured speed of the photon is 299792461 ± 68 m/s
>
A photon is sent from Paris at the time 13.00.000000000 ± 1ns
and is detected in Oslo at the time     13.00.004403046 ± 1ns
The measured speed of the photon is 299792461 ± 68 m/s
>
Any problem with this?
 
 No.
 Absolutely not.
 All you said is correct.
 R.H.
 
 OK. So you have realised that it is possible to synchronise
a clock in Oslo and a clock in Paris to within 1 ns if
we use the GPS.
 But have you realised that the clocks on the wall in
Oslo Airport and Paris Airport are synchronous to within
few seconds (probably better)?
 Please answer the question below, and don't flee yet again.
 Clocks in Oslo and Paris are showing the time UTC+2h.
 I leave Oslo Airport (Gardemoen Airport) when the watch on the airport
shows 12.00.00
I arrive at Paris Airport (Charles De Gaulle Airport) when the watch
on the airport shows 13.30.32.
 The difference is T = 1h 30m 32s
 Question #1:
============
Is it possible to calculate the duration of the journey (measured
in the ground frame) by comparing the reading of the clock in Oslo
at the departure and the reading of the clock in Paris at arrival?
 Yes or no, please.
  The distance in the ground frame between the airports is L = 1358.03 km.
 Question #2:
============
Is the real speed of the plane in the ground frame v = L/T = 900 km/h,
or is it impossible to know the real speed of the plane because
of the universal anisochrony?
 Yes or no, please.
The principles of relativity do not apply to your example because the time measurements you use are of the order of seconds, and the speeds you use are far too low (airliners) to have consistent measurements. Can you take more classical examples of RR where we go faster or measure smaller quantities of time?The principles of relativity do not apply to your example because the time measurements you use are of the order of seconds, and the speeds you use are far too low (airliners) to have consistent measurements. Can you take more classical examples of RR where we go faster or measure smaller quantities of time?
R.H.
Date Sujet#  Auteur
6 Aug 24 * "Time" vs "physical time"43Maciej Wozniak
6 Aug 24 +* Re: "Time" vs "physical time"30Richard Hachel
6 Aug 24 i+* Re: "Time" vs "physical time"2Python
6 Aug 24 ii`- Re: "Time" vs "physical time"1Maciej Wozniak
8 Aug 24 i+* Re: "Time" vs "physical time"2Thomas Heger
9 Aug 24 ii`- Re: "Time" vs "physical time"1Thomas Heger
8 Aug 24 i`* Re: "Time" vs "physical time"25Paul.B.Andersen
8 Aug 24 i +* Re: "Time" vs "physical time"18Richard Hachel
8 Aug 24 i i+* Re: "Time" vs "physical time"10J. J. Lodder
8 Aug 24 i ii`* Re: "Time" vs "physical time"9Richard Hachel
8 Aug 24 i ii `* Re: "Time" vs "physical time"8J. J. Lodder
8 Aug 24 i ii  +* Re: "Time" vs "physical time"6Richard Hachel
8 Aug 24 i ii  i`* Re: "Time" vs "physical time"5J. J. Lodder
9 Aug 24 i ii  i `* Re: "Time" vs "physical time"4Richard Hachel
9 Aug 24 i ii  i  `* Re: "Time" vs "physical time"3Baldomero Catalano
9 Aug 24 i ii  i   `* Re: "Time" vs "physical time"2Athel Cornish-Bowden
9 Aug 24 i ii  i    `- Re: "Time" vs "physical time"1Francisco Basurto
9 Aug 24 i ii  `- Re: "Time" vs "physical time"1Athel Cornish-Bowden
10 Aug 24 i i`* Re: "Time" vs "physical time"7Paul.B.Andersen
10 Aug 24 i i +- Re: "Time" vs "physical time"1Richard Hachel
10 Aug 24 i i `* Re: "Time" vs "physical time"5Richard Hachel
11 Aug 24 i i  `* Re: "Time" vs "physical time"4Paul.B.Andersen
11 Aug 24 i i   +- Re: "Time" vs "physical time"1Athel Cornish-Bowden
11 Aug 24 i i   `* Re: "Time" vs "physical time"2Richard Hachel
12 Aug 24 i i    `- Re: "Time" vs "physical time"1Paul.B.Andersen
8 Aug 24 i +* Re: "Time" vs "physical time"2Maciej Wozniak
8 Aug 24 i i`- Re: "Time" vs "physical time"1Richard Hachel
8 Aug 24 i `* Re: "Time" vs "physical time"4Roscoe Baklykov
9 Aug 24 i  `* Re: "Time" vs "physical time"3Athel Cornish-Bowden
9 Aug 24 i   `* Re: "Time" vs "physical time"2Python
9 Aug 24 i    `- Re: "Time" vs "physical time"1Satrnino Robustelli
6 Aug 24 `* Re: "Time" vs "physical time"12Python
6 Aug 24  `* Re: "Time" vs "physical time"11Maciej Wozniak
6 Aug 24   `* Re: "Time" vs "physical time"10Python
6 Aug 24    `* Re: "Time" vs "physical time"9Maciej Wozniak
6 Aug 24     +- Re: "Time" vs "physical time"1Python
6 Aug 24     `* Re: "Time" vs "physical time"7Python
6 Aug 24      `* Re: "Time" vs "physical time"6gharnagel
6 Aug 24       `* Re: "Time" vs "physical time"5Maciej Wozniak
6 Aug 24        +- Re: "Time" vs "physical time"1Richard Hachel
6 Aug 24        `* Re: "Time" vs "physical time"3gharnagel
6 Aug 24         +- Re: "Time" vs "physical time"1Maciej Wozniak
8 Aug 24         `- Re: "Time" vs "physical time"1Tchajegov Bakusov

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