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Groups > sci.physics.relativity > #479409
| From | Odd Bodkin <bodkinodd@gmail.com> |
|---|---|
| Newsgroups | sci.physics.relativity |
| Subject | Re: What is a field? |
| Date | 2018-12-09 00:13 +0000 |
| Organization | Aioe.org NNTP Server |
| Message-ID | <puhmn1$11gj$1@gioia.aioe.org> (permalink) |
| References | (2 earlier) <b4b4ec75-31f3-4ba9-b992-64d4101ee2c5@googlegroups.com> <d42c2e6f-218e-b6aa-e7fd-b703676902d6@PointedEars.de> <24aaf065-a933-4995-bb21-3e51cff08d82@googlegroups.com> <puhhc7$oa5$2@gioia.aioe.org> <9623308e-4788-4bca-8bbf-504974f13980@googlegroups.com> |
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. > > Yes, a stable orbit with just an attractive force is not feasible.... Oh but it is. You just don’t understand how and that frustrates you. When you don’t understand something, you invent something you do understand. But, as you can see from the lack of people downloading your book even though it’s FREE, nobody cares. > Newton’s formula includes centripetal acceleration and centrifugal > acceleration. For that matter action at a distance is not possible > without connection between the interacting objects. > >> >> I’ll point out this is is not a modern physics idea. It is a centuries-old >> HIGH SCHOOL physics idea. >> >> And your reaction is that if it makes no sense to you, then it must be >> wrong. >> >>> >>> >>>> >>>>> Is it not a solid body? >>>> >>>> Yes, a (mathematical) space is NOT a solid body. It is an *abstract* >>>> *concept* instead. It can be used, and is used, in physics, to describe >>>> Nature; but like other mathematical concepts, in mathematics it can also >>>> exist independently from Nature, and physics. >>>> >>>> A solid body can be described as being *in* a mathematical space. That >>>> is, some points of the space lie inside the body and some outside of it. >>>> It is often useful to place the origin of the coordinate system in the >>>> center of the body, or in its center of mass. >>>> >>>> <http://www.cornell.edu/video/richard-feynman-messenger-lecture-2-relation-mathematics-physics> >>>> >>>>> If it is not a solid body how can material objects interact with the >>>>> stresses exist within it? >>>> >>>> Stress is not something that a (whole) solid body interacts with; it just >>>> is, *for* the body, caused by the particles of the body interacting *with >>>> each other*. >>>> >>>> Please trim your quotes to the relevant minimum; that includes the >>>> attribution line. >>>> >>>> -- >>>> PointedEars >>>> >>>> Twitter: @PointedEars2 >>>> Please do not cc me. / Bitte keine Kopien per E-Mail. >>> >> >> >> >> -- >> Odd Bodkin — Maker of fine toys, tools, tables > -- Odd Bodkin — Maker of fine toys, tools, tables
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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? 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? 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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