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


Groups > sci.physics.relativity > #450766

Re: More Relativity; Subtraction of velocities keeping below light speed; as Additions do

From Sylvia Else <sylvia@not.at.this.address>
Newsgroups sci.physics.relativity
Subject Re: More Relativity; Subtraction of velocities keeping below light speed; as Additions do
Date 2018-02-25 16:50 +1100
Message-ID <fff163Fij89U1@mid.individual.net> (permalink)
References (2 earlier) <b06bc958-5ed1-4c41-946e-e00365c27ace@googlegroups.com> <ffehj4Ffj8aU1@mid.individual.net> <411115bb-8700-4ddb-a2ab-93060d1b690f@googlegroups.com> <fferkvFhgmpU1@mid.individual.net> <1551cfb4-8bfc-4bc6-9fab-0041630f0918@googlegroups.com>

Show all headers | View raw


On 25/02/2018 4:15 PM, mitchrae3323@gmail.com wrote:
> On Saturday, February 24, 2018 at 8:16:34 PM UTC-8, Sylvia Else wrote:
>> On 25/02/2018 12:41 PM, mitchrae3323@gmail.com wrote:
>>> On Saturday, February 24, 2018 at 5:24:56 PM UTC-8, Sylvia Else wrote:
>>>> On 25/02/2018 11:06 AM, mitchrae3323@gmail.com wrote:
>>>>> On Saturday, February 24, 2018 at 3:59:46 PM UTC-8, Sylvia Else wrote:
>>>>>> On 25/02/2018 10:53 AM, mitchrae3323@gmail.com wrote:
>>>>>>> Addition of velocities remaining below light speed are clearly understood when moving toward each other at near the speed of light; but what about moving away? That gives subtractions of velocities remaining below the speed light.
>>>>>>> This is an until now unrecognized flip side of relativity.
>>>>>>>
>>>>>>> Mitchell Raemsch
>>>>>>>
>>>>>>
>>>>>> It's already covered by the same formula.
>>>>>>
>>>>>> Sylvia.
>>>>>
>>>>> It should be.
>>>>> But where is it used? There is a difference between
>>>>> toward and away...
>>>>>
>>>>> Mitchell Raemsch
>>>>>
>>>>
>>>> It's used where the situation demands. Just change the sign of one of
>>>> the velocities.
>>>>
>>>> Sylvia.
>>>
>>> How do you define the situation?
>>> That is not how it works.
>>> How do you define the velocities as positive
>>> when they are subtracting?
>>> Why would it?
>>>
>>> Mitchell Raemsch
>>>
>>
>> The sign of the velocity is a convention. If the velocities are in the
>> same direction then they're both deemed positive, and the (inevitably
>> positive) result is for a velocity in the same direction.
>>
>> If the two velocities are in opposite directions, then you choose one of
>> them to be deemed positive, and the other negative. If the result is
>> positive, then the resulting velocity is in the direction of the
>> velocity deemed positive. Otherwise it's in the opposite direction.
>>
>> Sylvia.
> 
> Oh really?
> Then science has got that wrong...
> BOTH speeds have been subtracted from
> and remain below the speed of light.
> What you are saying is what I never believed.
> I will stay with this my own math understanding
> if you agree to disagree?
> 
> Mitchell Raemsch
> 
> 

I disagree that we should agree to disagree. The relativistic math is 
right. Your conviction that it's not is a delusion.

Sylvia.

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


Thread

More Relativity; Subtraction of velocities keeping below light speed; as Additions do mitchrae3323@gmail.com - 2018-02-24 15:53 -0800
  Re: More Relativity; Subtraction of velocities keeping below light speed; as Additions do Sylvia Else <sylvia@not.at.this.address> - 2018-02-25 10:59 +1100
    Re: More Relativity; Subtraction of velocities keeping below light speed; as Additions do mitchrae3323@gmail.com - 2018-02-24 16:06 -0800
      Re: More Relativity; Subtraction of velocities keeping below light speed; as Additions do Sylvia Else <sylvia@not.at.this.address> - 2018-02-25 12:24 +1100
        Re: More Relativity; Subtraction of velocities keeping below light speed; as Additions do mitchrae3323@gmail.com - 2018-02-24 17:41 -0800
          Re: More Relativity; Subtraction of velocities keeping below light speed; as Additions do Sylvia Else <sylvia@not.at.this.address> - 2018-02-25 15:16 +1100
            Re: More Relativity; Subtraction of velocities keeping below light speed; as Additions do mitchrae3323@gmail.com - 2018-02-24 21:15 -0800
              Re: More Relativity; Subtraction of velocities keeping below light speed; as Additions do Sylvia Else <sylvia@not.at.this.address> - 2018-02-25 16:50 +1100
                Re: More Relativity; Subtraction of velocities keeping below light speed; as Additions do mitchrae3323@gmail.com - 2018-02-24 21:58 -0800
                Re: More Relativity; Subtraction of velocities keeping below light speed; as Additions do Sylvia Else <sylvia@not.at.this.address> - 2018-02-25 19:18 +1100
                Re: More Relativity; Subtraction of velocities keeping below light speed; as Additions do mitchrae3323@gmail.com - 2018-02-25 15:02 -0800
              Re: More Relativity; Subtraction of velocities keeping below light speed; as Additions do pnalsing@gmail.com - 2018-02-24 22:08 -0800
  Re: More Relativity; Subtraction of velocities keeping below light speed; as Additions do David Waite <waitedavid1618@yahoo.com> - 2018-02-24 22:06 -0800

csiph-web