Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > sci.physics > #568456

Re: GPS Off Course

Cross-posted to 3 groups.

Followups directed to: sci.physics.relativity

Show all headers | View raw

hanson wrote:

> ds^2 = dx^2 + dy^2 + dz^2 - c^2dt^2    ..... [1].
>
> Some say ds^2 is "space-time", others say that
> ds is "space-time", other still insist that ds^2 or
> ds are "space-time intervals", while others are
> adamant that "s" happens to be "space-time"

Who, according to your research, says either one, and where?

> Just tell me the MLT dimensions of "space-time"

There are no “MLT dimensions of space-time”.  You are confused as to the 
proper use of the term “dimension”, and you do not understand yet what 
“space-time” is.  You must realize that there are different definitions for 
the term “dimension” as there are different contexts in which it is used, if 
you are going to understand “space-time” in physics.

<http://www.wolframalpha.com/input/?i=dimension&dataset=> pp.

Relevant here:

On the one hand there are dimensions in mathematics, of geometric manifolds, 
which are degrees of freedom in the choice of coordinates in such a 
manifold. 

<http://www.wolframalpha.com/input/?i=dimension&dataset=&rawformassumption=%7B%22C%22,
+%22dimension%22%7D+-%3E+%7B%22MathWorld%22%7D>

On the other hand there are dimensions in physics, of physical quantities 
which can be described in terms of combinations of the quantities mass (M), 
length (L), and time (T).

<https://en.wikipedia.org/wiki/Dimensional_analysis>

It just happens that because mechanics is concerned with the motion of 
bodies, it is useful in physics to consider the mathematical concept of 3+1 
space(-)time, as a body always occupies a particular position in space at a 
particular time.  Whereas motion can be described as a change in three 
spatial coordinates and one temporal coordinate.

<http://www.britannica.com/topic/Albert-Einstein-on-Space-Time-1987141>

HTH


F'up2 sci.physics.relativity

PointedEars
-- 
Q: Who's on the case when the electricity goes out?  
A: Sherlock Ohms.

(from: WolframAlpha)

Back to sci.physics | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

GPS Off Course The Starmaker <starmaker@ix.netcom.com> - 2016-04-01 12:21 -0800
  Re: GPS Off Course Sam Wormley <swormley1@gmail.com> - 2016-04-01 14:30 -0500
  Re: GPS Off Course jimp@specsol.spam.sux.com - 2016-04-01 22:15 +0000
  Re: GPS Off Course Sergio <invalid@invalid.com> - 2016-04-01 20:37 -0500
    Re: GPS Off Course The Starmaker <starmaker@ix.netcom.com> - 2016-04-01 19:26 -0800
      Re: GPS Off Course Sergio <invalid@invalid.com> - 2016-04-01 21:33 -0500
        Re: GPS Off Course Bimpy <pimp@pimp.com> - 2016-04-02 13:38 +0000
          Re: GPS Off Course Bimpy <pimp@pimp.com> - 2016-04-02 13:45 +0000
  Re: GPS Off Course Bimpy <pimp@pimp.com> - 2016-04-02 12:07 +0000
  Re: GPS Off Course Sam Wormley <swormley1@gmail.com> - 2016-04-02 08:49 -0500
    Re: GPS Off Course "hanson" <hanson@quick.net> - 2016-04-02 08:10 -0700
      Re: GPS Off Course "Paul B. Andersen" <relativity@paulba.no> - 2016-04-02 23:22 +0200
        Re: GPS Off Course "hanson" <hanson@quick.net> - 2016-04-02 16:20 -0700
          Re: GPS Off Course "Paul B. Andersen" <relativity@paulba.no> - 2016-04-03 13:37 +0200
            Re: GPS Off Course "hanson" <hanson@quick.net> - 2016-04-03 10:25 -0700
              Re: GPS Off Course "Paul B. Andersen" <relativity@paulba.no> - 2016-04-04 19:39 +0200
                Re: GPS Off Course "hanson" <hanson@quick.net> - 2016-04-04 13:34 -0700
                Re: GPS Off Course "Paul B. Andersen" <relativity@paulba.no> - 2016-04-05 09:41 +0200
                Re: GPS Off Course "hanson" <hanson@quick.net> - 2016-04-05 01:17 -0700
                Re: GPS Off Course "Paul B. Andersen" <relativity@paulba.no> - 2016-04-05 20:00 +0200
                ORI Re: GPS Off Course "hanson" <hanson@quick.net> - 2016-04-05 13:12 -0700
                Re: GPS Off Course "hanson" <hanson@quick.net> - 2016-04-05 13:54 -0700
                Re: ORI Re: GPS Off Course The Starmaker <starmaker@ix.netcom.com> - 2016-04-05 17:07 -0700
                Re: ORI Re: GPS Off Course "hanson" <hanson@quick.net> - 2016-04-05 17:26 -0700
                Re: GPS Off Course Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2016-04-07 04:40 +0200
                Re: GPS Off Course "hanson" <hanson@quick.net> - 2016-04-06 22:56 -0700
                Re: GPS Off Course Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2016-04-07 22:54 +0200
                Re: GPS Off Course "hanson" <hanson@quick.net> - 2016-04-07 17:02 -0700
                Re: GPS Off Course Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2016-04-08 05:36 +0200
                Re: GPS Off Course "hanson" <hanson@quick.net> - 2016-04-08 01:26 -0700
                Re: GPS Off Course "hanson" <hanson@quick.net> - 2016-04-08 22:16 -0700
                Re: GPS Off Course "hanson" <hanson@quick.net> - 2016-04-08 22:18 -0700
                Re: GPS Off Course Helmut Wabnig <hwabnig@.- --- -.dotat> - 2016-04-09 08:17 +0200
                Re: GPS Off Course "hanson" <hanson@quick.net> - 2016-04-09 00:24 -0700
  Re: GPS Off Course The Starmaker <starmaker@ix.netcom.com> - 2016-04-02 13:36 -0800
    Re: GPS Off Course The Starmaker <starmaker@ix.netcom.com> - 2016-04-02 13:38 -0800
      Re: GPS Off Course The Starmaker <starmaker@ix.netcom.com> - 2016-04-02 21:46 -0800

csiph-web