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Re: Failures of the Galilean transformation

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Am 20.09.2017 um 17:23 schrieb Thomas 'PointedEars' Lahn:
> [X-Post & F’up2 <news:sci.physics.relativity>]
>
> Arindam Banerjee wrote in <news:sci.physics>:
>
>> On Wednesday, September 20, 2017 at 9:37:46 PM UTC+10, Thomas
>> 'PointedEars' Lahn wrote:
>>> Arindam Banerjee wrote:
>>>> On Wednesday, September 13, 2017 at 2:06:56 PM UTC+10, sci.physics
>>>> wrote:
>>>>> How much energy will it take to get these spaceships to travel faster
>>>>> than light?
>>>>>
>>>>> Where does this energy come from?
>>>>
>>>> If the acceleration of the ship is g or say 10m./sec^2 then from rest
>>>> the ship will reach the speed of light
>>
>> In 347 days
>
> Argumentum ad nauseam.
>
> No, it will not *ever* reach the speed of light using conventional
> propulsion.

The spaceship can have any velocity it desires to have, if it flies 
unaccelerated.

That could be zero or infinity, as you prefer.

This is so, because the spaceship cannot define an absolute zero point 
in space, in respect which it has a certain velocity.

IOW: speed is 'relative'.

The spaceship crew could say 'well, we don't know how fast we are. But 
at least we are at rest in respect to ourselves'.

This does in fact make some sense and that is actually what we usually do.

We measure the velocity of - say - a car in respect to the street the 
car is rolling upon. But we ignore the velocity caused by Earth' 
rotation around its axis and the rotation of that axis around the sun 
and the rotation of the sun about the center of our galaxy.

This center moves around the center of our local galaxy cluster and how 
that might move, we don't know.

So we stick to street velocity (in connection with cars), even if this 
is a local measure and relative to the Earth surface.

Now you certainly say, there is a reference point, upon we could base 
our measurement of velocity.

Unfortunately this is not the case and actually relativity tells us, 
that velocity is 'relative'.

So I could say, I move with light speed away from something remote, that 
is almost invisible and that something would be my personal reference point.

This would make my current velocity c. But I could also use the chair 
I'm sitting on as reference and have then velocity zero.

And I could do this both at the same time.


TH
...

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Failures of the Galilean transformation (was: The Song of Lt. Cdr. Data) Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2017-09-20 17:23 +0200
  Failures of the Galilean transformation (was: The Song of Lt. Cdr. Data) "David (Kronos Prime) Fuller" <fuller.david@hotmail.com> - 2017-09-20 08:36 -0700
  Re: Failures of the Galilean transformation Thomas Heger <ttt_heg@web.de> - 2017-09-21 15:10 +0200
    Re: Failures of the Galilean transformation mlwozniak@wp.pl - 2017-09-21 06:29 -0700
      Re: Failures of the Galilean transformation Thomas Heger <ttt_heg@web.de> - 2017-09-22 20:27 +0200
        Re: Failures of the Galilean transformation mlwozniak@wp.pl - 2017-09-22 12:13 -0700
          Re: Failures of the Galilean transformation Thomas Heger <ttt_heg@web.de> - 2017-09-22 21:36 +0200
            Re: Failures of the Galilean transformation Kos Etrakis <uar@ksskkwi.ck> - 2017-09-22 20:09 +0000
              Re: Failures of the Galilean transformation Thomas Heger <ttt_heg@web.de> - 2017-09-23 12:10 +0200
            Re: Failures of the Galilean transformation mlwozniak@wp.pl - 2017-09-22 13:30 -0700
              Re: Failures of the Galilean transformation Thomas Heger <ttt_heg@web.de> - 2017-09-23 12:56 +0200
                Re: Failures of the Galilean transformation mlwozniak@wp.pl - 2017-09-23 05:09 -0700
                Re: Failures of the Galilean transformation Thomas Heger <ttt_heg@web.de> - 2017-09-24 21:31 +0200
                Re: Failures of the Galilean transformation Poutnik <poutnik@privacy.net> - 2017-09-24 21:43 +0200
                Re: Failures of the Galilean transformation Thomas Heger <ttt_heg@web.de> - 2017-09-25 21:26 +0200
                Re: Failures of the Galilean transformation Poutnik <poutnik@privacy.net> - 2017-09-25 22:00 +0200
                Re: Failures of the Galilean transformation Thomas Heger <ttt_heg@web.de> - 2017-09-26 21:45 +0200
                Re: Failures of the Galilean transformation Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2017-09-29 01:52 +0200
                Re: Failures of the Galilean transformation Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2017-09-27 09:50 +0200
                Re: Failures of the Galilean transformation mlwozniak@wp.pl - 2017-09-24 22:57 -0700
                Re: Failures of the Galilean transformation Thomas Heger <ttt_heg@web.de> - 2017-09-25 10:23 +0200
                Re: Failures of the Galilean transformation mlwozniak@wp.pl - 2017-09-25 02:07 -0700
                Re: Failures of the Galilean transformation Thomas Heger <ttt_heg@web.de> - 2017-09-25 21:14 +0200
                Re: Failures of the Galilean transformation mlwozniak@wp.pl - 2017-09-25 13:10 -0700
                Re: Failures of the Galilean transformation Thomas Heger <ttt_heg@web.de> - 2017-09-26 22:12 +0200
                Re: Failures of the Galilean transformation mlwozniak@wp.pl - 2017-09-26 22:41 -0700
                Re: Failures of the Galilean transformation Thomas Heger <ttt_heg@web.de> - 2017-09-28 21:09 +0200
                Re: Failures of the Galilean transformation mlwozniak@wp.pl - 2017-09-28 13:14 -0700
                Re: Failures of the Galilean transformation Thomas Heger <ttt_heg@web.de> - 2017-09-29 14:10 +0200
                Re: Failures of the Galilean transformation mlwozniak@wp.pl - 2017-09-29 06:09 -0700
                Re: Failures of the Galilean transformation Thomas Heger <ttt_heg@web.de> - 2017-09-30 16:39 +0200
                Re: Failures of the Galilean transformation mlwozniak@wp.pl - 2017-09-30 08:12 -0700

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