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Groups > sci.physics.relativity > #479503

Re: What is a field?

From Odd Bodkin <bodkinodd@gmail.com>
Newsgroups sci.physics.relativity
Subject Re: What is a field?
Date 2018-12-09 22:22 +0000
Organization Aioe.org NNTP Server
Message-ID <puk4j0$1l4k$1@gioia.aioe.org> (permalink)
References (2 earlier) <b4b4ec75-31f3-4ba9-b992-64d4101ee2c5@googlegroups.com> <d42c2e6f-218e-b6aa-e7fd-b703676902d6@PointedEars.de> <24aaf065-a933-4995-bb21-3e51cff08d82@googlegroups.com> <puhhc7$oa5$2@gioia.aioe.org> <69f1a0dd-2890-4fbd-9576-8fa758572ae3@googlegroups.com>

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kenseto <setoken@att.net> wrote:
> On Saturday, December 8, 2018 at 5:42:19 PM UTC-5, Odd Bodkin wrote:
>> kenseto <setoken@att.net> wrote:
>>> On Saturday, December 8, 2018 at 2:09:37 PM UTC-5, Thomas 'PointedEars' Lahn wrote:
>>>> kenseto wrote:
>>>>> […] Thomas 'PointedEars' Lahn wrote:
>>>>>> kenseto wrote:
>>>>>>> According to Steven Weinberg: A field is a sort of stress in space,
>>>>>>> something like the various sorts of stress that are possible within
>>>>>>> a solid body.
>>>>>> 
>>>>>> Where and when did he write/say this?
>>>>>> 
>>>>>> IIRC, we have been over this here.
>>>>>> 
>>>>>> A field in physics is simply an object in models where every point in a
>>>>>> mathematical space is assigned a value:
>>>>> 
>>>>> So Weinberg’s description that a field is the stress exists at every point
>>>>> in a solid body is very close to the  correct description.
>>>> 
>>>> No, it is not.  And probably you misquoted or misunderstood him.
>>>> 
>>>>> In any case what is mathematical space?
>>>> 
>>>> *A* mathematical space is (put simply) *an* abstract entity in which (a)
>>>> coordinate(s) is/are assigned to each point.  And there are rules
>>>> (operations) that define how you can get from one point to another, for example.
>>>> 
>>>> (There is not *the* mathematical space.)
>>>> 
>>>> The concept of a field uses this.  You can assign a value to every point in
>>>> a mathematical space as described by its coordinates.  That value can be a
>>>> number (scalar), perhaps with a unit; it can be a vector itself, or in
>>>> general it can be a tensor.  (See below.)
>>>> 
>>>> If the value is that of a *physical* quantity (like temperature, force,
>>>> acceleration, or stress), then you can use this field to describe physical
>>>> reality mathematically.  In the first example in my previous follow-up, the
>>>> coordinate system was defined so that the heat source was in its origin
>>>> because the temperature was highest there (note the peak); it became lower
>>>> as the distance from the origin – given by √(x² + y²), according to the
>>>> Pythagorean theorem – increased.
>>> 
>>> This mathematical approach is devoting the physical explanation why
>>> material objects interacting with each other at a distance. For example,
>>> what is the physical cause of gravity....why object orbiting each other
>>> without falling into each other?
>> 
>> This is where even the simple ideas elude you. To you, an attractive force
>> could only conceivably result in the two attracting objects approaching
>> each other. To you, the idea of a stable circular orbit with no decrease in
>> distance is impossible with an attractive force — it’s just inconceivable
>> to you. 
> 
> That’s right.....stable orbit between the moon and the earth is not
> possible with just an attractive force. 

Open your copy of Halliday and Resnick, an introductory book. The chapter
on circular motion says otherwise. 

> The earth and the moon are attracted to each other because they are
> expanding in the same direction in the E-Matrix as the universe expands. 
> OTOH, the earth and the moon are confined to follow the divergent
> structure of the E-Matrix (momentum) and this contributes a continuous
> tangential motion to the orbit of the moon. The combination of these two
> forces is what makes the moon to achieves a stable orbit.
> 
> Newton’s equation including these two opposing forces and that’s why it
> is able to calculate the orbit of the moon.

Newton’s equation involves nothing from your e-matrix and you know it.
Newton’s description of circular motion involves only a centripetal force
and not a centrifugal force. Look in Halliday and Resnick. 

> 
> 
> 



-- 
Odd Bodkin -- maker of fine toys, tools, tables

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Thread

What is a field? kenseto <setoken@att.net> - 2018-12-07 06:08 -0800
  Re: What is a field? Odd Bodkin <bodkinodd@gmail.com> - 2018-12-07 16:58 +0000
    Re: What is a field? paulcardinale0@gmail.com - 2018-12-07 11:58 -0800
    Re: What is a field? kenseto <setoken@att.net> - 2018-12-08 06:05 -0800
      Re: What is a field? Odd Bodkin <bodkinodd@gmail.com> - 2018-12-08 14:13 +0000
  Re: What is a field? JanPB <filmart@gmail.com> - 2018-12-07 11:39 -0800
    Re: What is a field? kenseto <setoken@att.net> - 2018-12-08 06:28 -0800
      Re: What is a field? Odd Bodkin <bodkinodd@gmail.com> - 2018-12-08 15:35 +0000
        Re: What is a field? kenseto <setoken@att.net> - 2018-12-08 10:33 -0800
          Re: What is a field? JanPB <filmart@gmail.com> - 2018-12-08 10:43 -0800
          Re: What is a field? Odd Bodkin <bodkinodd@gmail.com> - 2018-12-08 19:15 +0000
      Re: What is a field? moroney@world.std.spaamtrap.com (Michael Moroney) - 2018-12-08 17:52 +0000
        Re: What is a field? Odd Bodkin <bodkinodd@gmail.com> - 2018-12-08 18:21 +0000
        Re: What is a field? kenseto <setoken@att.net> - 2018-12-08 10:26 -0800
          Re: What is a field? moroney@world.std.spaamtrap.com (Michael Moroney) - 2018-12-08 18:37 +0000
          Re: What is a field? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2018-12-08 20:18 +0100
            Re: What is a field? Odd Bodkin <bodkinodd@gmail.com> - 2018-12-08 19:56 +0000
              Re: What is a field? JanPB <filmart@gmail.com> - 2018-12-08 21:51 -0800
              Re: What is a field? kenseto <setoken@att.net> - 2018-12-09 08:20 -0800
                Re: What is a field? JanPB <filmart@gmail.com> - 2018-12-09 12:44 -0800
                Re: What is a field? Odd Bodkin <bodkinodd@gmail.com> - 2018-12-09 22:20 +0000
                Re: What is a field? kenseto <setoken@att.net> - 2018-12-10 08:04 -0800
                Re: What is a field? JanPB <filmart@gmail.com> - 2018-12-10 10:31 -0800
                Re: What is a field? kenseto <setoken@att.net> - 2018-12-10 13:33 -0800
                Re: What is a field? JanPB <filmart@gmail.com> - 2018-12-10 13:53 -0800
                Re: What is a field? kenseto <setoken@att.net> - 2018-12-11 06:16 -0800
                Re: What is a field? moroney@world.std.spaamtrap.com (Michael Moroney) - 2018-12-11 14:41 +0000
                Re: What is a field? Odd Bodkin <bodkinodd@gmail.com> - 2018-12-10 22:00 +0000
                Re: What is a field? JanPB <filmart@gmail.com> - 2018-12-10 14:13 -0800
                Re: What is a field? Odd Bodkin <bodkinodd@gmail.com> - 2018-12-10 23:03 +0000
                Re: What is a field? JanPB <filmart@gmail.com> - 2018-12-10 15:46 -0800
                Re: What is a field? Odd Bodkin <bodkinodd@gmail.com> - 2018-12-11 01:37 +0000
                Re: What is a field? Prokaryotic Caspase Homolog <prokaryotic.caspase.homolog@gmail.com> - 2018-12-10 16:26 -0800
                Re: What is a field? kenseto <setoken@att.net> - 2018-12-11 07:32 -0800
                Re: What is a field? Odd Bodkin <bodkinodd@gmail.com> - 2018-12-12 13:53 +0000
                Re: What is a field? kenseto <setoken@att.net> - 2018-12-13 07:27 -0800
                Re: What is a field? kenseto <setoken@att.net> - 2018-12-11 07:27 -0800
                Re: What is a field? moroney@world.std.spaamtrap.com (Michael Moroney) - 2018-12-11 16:00 +0000
                Re: What is a field? Odd Bodkin <bodkinodd@gmail.com> - 2018-12-10 21:56 +0000
                Re: What is a field? kenseto <setoken@att.net> - 2018-12-11 06:51 -0800
                Re: What is a field? Odd Bodkin <bodkinodd@gmail.com> - 2018-12-11 18:42 +0000
                Re: What is a field? kenseto <setoken@att.net> - 2018-12-11 18:09 -0800
                Re: What is a field? JanPB <filmart@gmail.com> - 2018-12-11 20:18 -0800
                Re: What is a field? Odd Bodkin <bodkinodd@gmail.com> - 2018-12-12 13:53 +0000
                Re: What is a field? kenseto <setoken@att.net> - 2018-12-13 07:21 -0800
                Re: What is a field? Odd Bodkin <bodkinodd@gmail.com> - 2018-12-13 18:32 +0000
                Re: What is a field? kenseto <setoken@att.net> - 2018-12-13 13:20 -0800
                Re: What is a field? Odd Bodkin <bodkinodd@gmail.com> - 2018-12-13 21:46 +0000
                Re: What is a field? JanPB <filmart@gmail.com> - 2018-12-13 10:47 -0800
                Re: What is a field? moroney@world.std.spaamtrap.com (Michael Moroney) - 2018-12-14 05:35 +0000
                Re: What is a field? kenseto <setoken@att.net> - 2018-12-14 15:13 -0800
                Re: What is a field? JanPB <filmart@gmail.com> - 2018-12-14 15:22 -0800
                Re: What is a field? kenseto <setoken@att.net> - 2018-12-15 14:05 -0800
                Re: What is a field? JanPB <filmart@gmail.com> - 2018-12-15 23:27 -0800
                Re: What is a field? kenseto <setoken@att.net> - 2018-12-17 08:24 -0800
                Re: What is a field? "David (Kronos Prime) Fuller" <fuller.david@hotmail.com> - 2018-12-17 08:31 -0800
                Re: What is a field? JanPB <filmart@gmail.com> - 2018-12-17 09:51 -0800
                Re: What is a field? mlwozniak@wp.pl - 2018-12-17 10:06 -0800
                Re: What is a field? Odd Bodkin <bodkinodd@gmail.com> - 2018-12-18 02:23 +0000
                Re: What is a field? kenseto <setoken@att.net> - 2018-12-18 07:41 -0800
                Re: What is a field? JanPB <filmart@gmail.com> - 2018-12-18 12:43 -0800
                Re: What is a field? Odd Bodkin <bodkinodd@gmail.com> - 2018-12-19 14:17 +0000
                Re: What is a field? moroney@world.std.spaamtrap.com (Michael Moroney) - 2018-12-19 15:46 +0000
                Re: What is a field? benj <benj.fake@gmail.com> - 2018-12-12 13:04 -0500
            Re: What is a field? benj <benj.fake@gmail.com> - 2018-12-08 23:30 -0500
            Re: What is a field? kenseto <setoken@att.net> - 2018-12-09 08:12 -0800
              Re: What is a field? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2018-12-09 17:19 +0100
          Re: What is a field? Rich Carpenter <lcug@kigcohc.pa> - 2018-12-09 00:32 +0000
      Re: What is a field? JanPB <filmart@gmail.com> - 2018-12-08 10:42 -0800
        Re: What is a field? Odd Bodkin <bodkinodd@gmail.com> - 2018-12-08 19:15 +0000
          Re: What is a field? benj <benj.fake@gmail.com> - 2018-12-08 23:29 -0500
            Re: What is a field? kenseto <setoken@att.net> - 2018-12-10 06:18 -0800
              Re: What is a field? JanPB <filmart@gmail.com> - 2018-12-10 07:26 -0800
                Re: What is a field? kenseto <setoken@att.net> - 2018-12-10 08:11 -0800
                Re: What is a field? moroney@world.std.spaamtrap.com (Michael Moroney) - 2018-12-10 17:07 +0000
                Re: What is a field? Odd Bodkin <bodkinodd@gmail.com> - 2018-12-10 22:00 +0000
                Re: What is a field? kenseto <setoken@att.net> - 2018-12-11 07:14 -0800
                Re: What is a field? Odd Bodkin <bodkinodd@gmail.com> - 2018-12-11 18:42 +0000
                Re: What is a field? kenseto <setoken@att.net> - 2018-12-12 04:56 -0800
                Re: What is a field? Odd Bodkin <bodkinodd@gmail.com> - 2018-12-12 13:53 +0000
        Re: What is a field? kenseto <setoken@att.net> - 2018-12-09 07:54 -0800
          Re: What is a field? kenseto <setoken@att.net> - 2018-12-09 07:58 -0800
          Re: What is a field? Odd Bodkin <bodkinodd@gmail.com> - 2018-12-09 22:20 +0000
            Re: What is a field? benj <benj.fake@gmail.com> - 2018-12-12 13:00 -0500
              Re: What is a field? Odd Bodkin <bodkinodd@gmail.com> - 2018-12-12 18:14 +0000
                Re: What is a field? benj <benj.fake@gmail.com> - 2018-12-13 10:59 -0500
                Re: What is a field? kenseto <setoken@att.net> - 2018-12-13 08:51 -0800
                Re: What is a field? Odd Bodkin <bodkinodd@gmail.com> - 2018-12-13 18:32 +0000
                Re: What is a field? kenseto <setoken@att.net> - 2018-12-13 13:23 -0800
                Re: What is a field? Odd Bodkin <bodkinodd@gmail.com> - 2018-12-13 21:46 +0000
                Re: What is a field? Odd Bodkin <bodkinodd@gmail.com> - 2018-12-13 23:36 +0000
                Re: What is a field? benj <benj.fake@gmail.com> - 2018-12-13 20:06 -0500
                Re: What is a field? Odd Bodkin <bodkinodd@gmail.com> - 2018-12-14 12:21 +0000
                Re: What is a field? kenseto <setoken@att.net> - 2018-12-14 15:16 -0800
                Re: What is a field? Odd Bodkin <bodkinodd@gmail.com> - 2018-12-15 02:14 +0000
                Re: What is a field? benj <benj.fake@gmail.com> - 2018-12-13 19:53 -0500
                Re: What is a field? Odd Bodkin <bodkinodd@gmail.com> - 2018-12-14 12:21 +0000
              Re: What is a field? JanPB <filmart@gmail.com> - 2018-12-12 10:38 -0800
  Re: What is a field? mitchrae3323@gmail.com - 2018-12-07 12:48 -0800
    Re: What is a field? JanPB <filmart@gmail.com> - 2018-12-07 12:51 -0800
      Re: What is a field? "Ross A. Finlayson" <ross.finlayson@gmail.com> - 2018-12-08 12:22 -0800
        Re: What is a field? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2018-12-08 22:05 +0100
          Re: What is a field? "Ross A. Finlayson" <ross.finlayson@gmail.com> - 2018-12-08 16:24 -0800
        Re: What is a field? benj <benj.fake@gmail.com> - 2018-12-08 23:46 -0500
          Re: What is a field? "Ross A. Finlayson" <ross.finlayson@gmail.com> - 2018-12-08 22:41 -0800
            Re: What is a field? "Ross A. Finlayson" <ross.finlayson@gmail.com> - 2018-12-09 14:08 -0800
              Re: What is a field? "Ross A. Finlayson" <ross.finlayson@gmail.com> - 2018-12-09 14:44 -0800
                Re: What is a field? benj <benj.fake@gmail.com> - 2018-12-12 13:36 -0500
                Re: What is a field? "Ross A. Finlayson" <ross.finlayson@gmail.com> - 2019-01-13 12:16 -0800
        Re: What is a field? JanPB <filmart@gmail.com> - 2018-12-08 21:56 -0800
          Re: What is a field? "Ross A. Finlayson" <ross.finlayson@gmail.com> - 2018-12-08 22:54 -0800
            Re: What is a field? "Ross A. Finlayson" <ross.finlayson@gmail.com> - 2018-12-08 23:22 -0800
              Re: What is a field? "Ross A. Finlayson" <ross.finlayson@gmail.com> - 2018-12-09 12:35 -0800
  Re: What is a field? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2018-12-07 22:01 +0100
    Re: What is a field? kenseto <setoken@att.net> - 2018-12-08 06:42 -0800
      Re: What is a field? Odd Bodkin <bodkinodd@gmail.com> - 2018-12-08 15:35 +0000
        Re: What is a field? kenseto <setoken@att.net> - 2018-12-08 10:21 -0800
          Re: What is a field? Odd Bodkin <bodkinodd@gmail.com> - 2018-12-08 19:15 +0000
            Re: What is a field? kenseto <setoken@att.net> - 2018-12-08 14:17 -0800
              Re: What is a field? Odd Bodkin <bodkinodd@gmail.com> - 2018-12-08 22:42 +0000
                Re: What is a field? kenseto <setoken@att.net> - 2018-12-08 14:58 -0800
                Re: What is a field? moroney@world.std.spaamtrap.com (Michael Moroney) - 2018-12-09 01:22 +0000
                Re: What is a field? Odd Bodkin <bodkinodd@gmail.com> - 2018-12-09 13:07 +0000
            Re: What is a field? benj <benj.fake@gmail.com> - 2018-12-08 23:26 -0500
              Re: What is a field? Odd Bodkin <bodkinodd@gmail.com> - 2018-12-09 13:07 +0000
        Re: What is a field? kenseto <setoken@att.net> - 2018-12-08 10:27 -0800
          Re: What is a field? Odd Bodkin <bodkinodd@gmail.com> - 2018-12-08 19:15 +0000
          Re: What is a field? benj <benj.fake@gmail.com> - 2018-12-08 23:23 -0500
            Re: What is a field? Odd Bodkin <bodkinodd@gmail.com> - 2018-12-09 13:07 +0000
            Re: What is a field? kenseto <setoken@att.net> - 2018-12-09 14:19 -0800
              Re: What is a field? Odd Bodkin <bodkinodd@gmail.com> - 2018-12-09 22:25 +0000
                Re: What is a field? kenseto <setoken@att.net> - 2018-12-10 07:54 -0800
                Re: What is a field? moroney@world.std.spaamtrap.com (Michael Moroney) - 2018-12-10 17:15 +0000
                Re: What is a field? Odd Bodkin <bodkinodd@gmail.com> - 2018-12-10 21:41 +0000
                Re: What is a field? benj <benj.fake@gmail.com> - 2018-12-12 13:14 -0500
                Re: What is a field? Odd Bodkin <bodkinodd@gmail.com> - 2018-12-12 18:18 +0000
      Re: What is a field? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2018-12-08 20:09 +0100
        Re: What is a field? kenseto <setoken@att.net> - 2018-12-08 14:28 -0800
          Re: What is a field? Odd Bodkin <bodkinodd@gmail.com> - 2018-12-08 22:42 +0000
            Re: What is a field? kenseto <setoken@att.net> - 2018-12-08 14:56 -0800
              Re: What is a field? Dirk Van de moortel <dirkvandemoortel@notmail.com> - 2018-12-09 00:06 +0100
              Re: What is a field? Odd Bodkin <bodkinodd@gmail.com> - 2018-12-09 00:13 +0000
                Re: What is a field? benj <benj.fake@gmail.com> - 2018-12-08 23:44 -0500
                Re: What is a field? kenseto <setoken@att.net> - 2018-12-09 09:19 -0800
                Re: What is a field? Odd Bodkin <bodkinodd@gmail.com> - 2018-12-09 22:22 +0000
                Re: What is a field? kenseto <setoken@att.net> - 2018-12-10 07:50 -0800
                Re: What is a field? moroney@world.std.spaamtrap.com (Michael Moroney) - 2018-12-10 17:09 +0000
                Re: What is a field? Odd Bodkin <bodkinodd@gmail.com> - 2018-12-10 21:41 +0000
            Re: What is a field? benj <benj.fake@gmail.com> - 2018-12-08 23:37 -0500
              Re: What is a field? Odd Bodkin <bodkinodd@gmail.com> - 2018-12-09 13:07 +0000
            Re: What is a field? kenseto <setoken@att.net> - 2018-12-09 08:40 -0800
              Re: What is a field? Odd Bodkin <bodkinodd@gmail.com> - 2018-12-09 22:22 +0000
                Re: What is a field? kenseto <setoken@att.net> - 2018-12-10 08:07 -0800
                Re: What is a field? Odd Bodkin <bodkinodd@gmail.com> - 2018-12-10 21:56 +0000
                Re: What is a field? kenseto <setoken@att.net> - 2018-12-11 07:07 -0800
                Re: What is a field? Odd Bodkin <bodkinodd@gmail.com> - 2018-12-11 18:42 +0000
                Re: What is a field? kenseto <setoken@att.net> - 2018-12-11 18:19 -0800
                Re: What is a field? Odd Bodkin <bodkinodd@gmail.com> - 2018-12-12 13:53 +0000
                Re: What is a field? kenseto <setoken@att.net> - 2018-12-13 07:54 -0800
                Re: What is a field? Odd Bodkin <bodkinodd@gmail.com> - 2018-12-13 18:32 +0000
          Re: What is a field? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2018-12-09 01:24 +0100
            Re: What is a field? benj <benj.fake@gmail.com> - 2018-12-08 23:42 -0500
            Re: What is a field? kenseto <setoken@att.net> - 2018-12-09 10:08 -0800
              Re: What is a field? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2018-12-09 19:36 +0100
        Re: What is a field? kenseto <setoken@att.net> - 2018-12-08 14:43 -0800
          Re: What is a field? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2018-12-09 11:51 +0100
  Re: What is a field? carleto4157990662@gmail.com - 2018-12-07 13:42 -0800
  Re: What is a field? "Chris M. Thomasson" <invalid_chris_thomasson@invalid.invalid> - 2018-12-15 19:51 -0800

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