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

Groups > sci.physics.relativity > #596508

Re: SR without panties

Show all headers | View raw

On 11/30/2022 2:01 AM, Thomas Heger wrote:
> Am 29.11.2022 um 19:46 schrieb whodat:
>> On 11/29/2022 1:36 AM, Thomas Heger wrote:
>>> Am 28.11.2022 um 07:54 schrieb whodat:
>>>
>>>>> Hold on, if A is moving relative to B at v1, then B is moving relative
>>>>> to A at -v1. You wrote v2.  Or did you mean A moves relative to (some
>>>>> unmentioned) C, perhaps an observer, at v1, and B moves relative to C
>>>>> or the observer at v2?
>>>>
>>>> If you use the term "relative to" then there is no + or -. As a
>>>> simple "difference" the number is absolute. There are workarounds
>>>> that can get you to arithmetic differences. I realize this is a
>>>> sort of nitpick, but I think it is an important one.
>>> ???
>>>
>>> To me this sounds like nonsense!
>>
>>
>> Of course it does, but then you lack the basic essential skills
>> essential to understanding such elementary things. Please find
>> pastimes better suited to your abilities. Thanks.
> 
> 
> What you call 'basic skills' apparently includes to call negative 
> numbers 'positive'.
> 
> I cannot follow you here, because to me this sounds disgusting.
> 
> In physics velocity is always a vector and has always a direction.

Velocity can be modeled as a vector. The OP problem addresses motion of
one object relative to another. Direction plays no role in the posted
question. To do so now is a fallacy called moving the goalposts.

> If you like to address the amount, you could do so and omit the sign and 
> direction by writing |v|.
> 
> If you don't, v is a vector.
> 
> TH

Speed is never negative. Speed has magnitude and direction.
"-" is not a direction.

The context of the OP problem does not provide direction, only the
arithmetic difference between the speeds of two objects. Two race
cars are on a track. One is moving at 100mph the other at 90mpg.
The difference is 10mph, never -10mph.

Please find pastimes better suited to your abilities

IBID. I'll not go around on this topic again.

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

Thread

SR without panties beda pietanza <bedapietanza@gmail.com> - 2022-11-27 15:43 -0800
  Re: SR without panties rotchm <rotchm@gmail.com> - 2022-11-27 17:38 -0800
  Re: SR without panties rotchm <rotchm@gmail.com> - 2022-11-27 17:42 -0800
    Re: SR without panties beda pietanza <bedapietanza@gmail.com> - 2022-11-28 01:43 -0800
    Re: SR without panties Maciej Wozniak <maluwozniak@gmail.com> - 2022-11-28 01:53 -0800
  Re: SR without panties Volney <volney@invalid.invalid> - 2022-11-28 01:28 -0500
    Re: SR without panties whodat <whodaat@void.nowgre.com> - 2022-11-28 00:54 -0600
      Re: SR without panties Thomas Heger <ttt_heg@web.de> - 2022-11-29 08:36 +0100
        Re: SR without panties beda pietanza <bedapietanza@gmail.com> - 2022-11-29 02:33 -0800
        Re: SR without panties whodat <whodaat@void.nowgre.com> - 2022-11-29 12:46 -0600
          Re: SR without panties Thomas Heger <ttt_heg@web.de> - 2022-11-30 09:01 +0100
            Re: SR without panties whodat <whodaat@void.nowgre.com> - 2022-11-30 11:43 -0600
              Re: SR without panties Thomas Heger <ttt_heg@web.de> - 2022-12-01 10:33 +0100
                Re: SR without panties Mitch Leoni <nien@iltcntco.ws> - 2022-12-01 16:15 +0000
                Re: SR without panties Thomas Heger <ttt_heg@web.de> - 2022-12-02 08:04 +0100
    Re: SR without panties Maciej Wozniak <maluwozniak@gmail.com> - 2022-11-27 23:09 -0800
    Re: SR without panties beda pietanza <bedapietanza@gmail.com> - 2022-11-29 02:23 -0800
      Re: SR without panties Volney <volney@invalid.invalid> - 2022-11-29 21:52 -0500
        Re: SR without panties Maciej Wozniak <maluwozniak@gmail.com> - 2022-11-29 22:40 -0800
        Re: SR without panties beda pietanza <bedapietanza@gmail.com> - 2022-11-30 03:47 -0800

csiph-web