Re: lorenz transformation and spped of light

"JM Albuquerque" <jmDOTa2@xxxxxxx> wrote in message
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Two spacecrafts running at opposite directions at 0.8c each, the
lorenz transformation says that their relative speed perception is u=
(0.8c+0.8c)/(1+(0.8c*0.8c/c²))= 0.975c.

It not a "perception" .. it IS their relative speed (ie the speed of
the
second spaceship in the iFoR of the first). SR doesn't talk about
optical
illusions :)
That's completely nonsense.
No .. its not
Yes, it is.

No .. SR is not about perceptions and illusions. It is about what is real
and measured.

Of course it's a perception,
No .. its not
Yes, it is.

No .. it is not about perception .. it is about reality. It doesn't rely on
anyone seeing things .. nor about optical illusions

since the problem starts saying:
Two spacecrafts running at opposite directions at 0.8c each.
Why cannot the reality be that of two spacecrafts running at
opposite directions at 0.8c each?
It is
So, what makes that reality different then your?

It is the same reality in different frames of reference .. all are real.

We build two spacecrafts, we place then back-to-back,
and we fire them with a program that guarantees that in
a given time and a given distance, both will be running
at 0.8c.
They do
So we know what the reality is.
In the stationary frame of reference .. yes
The value 0.975c is only a perception, not the reality.
No .. it is reality
And why not the previous one?

Who said the previous one was not reality. It is all reality. Each as
equally real as the other.

Nevertheless, we can imagine that each spacecraft has a
pilote and that pilote wants to compute how much time will
it take to receive signals from the other spacecraft.
Each pilot, of each spacecraft can compute its absolute
speed relative to the distant fixed stars.
That is not absolute speed
OK.
Make it the speed relative to the fixed stars.

Stars fixed relative to what? You do realise the the entire unvierse is
expanding .. everything is in motion relative to something else.

Now, each pilot
wants to know where the other spacecraft is (what distance).
Both spacecrafts send light signals to each other.
Each pilot measures the redshift of those signals and
come up to the conclusion that such redshift indicates
a relative speed of 0.975c
No .. it has nothing to do with light signals. .the other space craft
REALLY IS travelling at 0.975c
No it is not.

Yes .. it is

That's a relative speed, so there are as many speeds
as you like.

That's right. And they are all just as real as each other

Since each pilot knows its absolute speed from the
fixed stars to be 0.8c, it will be able to compute the
other spacecraft speed "x" to be that:
(x+0.8c)/(1+(x*0.8c/c²))= 0.975c.
So, that x = 0.8c.
Knowing its speed and the others speed, each pilot
can predict where in "reality" the other spacecraft is.
Yes .. and in reality the other craft is travelling at 0.975c in the
first spaaceship's iFoR
In one and only one of many realities.

No .. one reality .. just different frames of reference

That's what SR is all about - RELATIVITY.
Not the reality.
SR is not about perception .. you seem to think that SR is just an
optical illusion.
Sortof, yes.

Then you are wrong .. sortof.


.

Relevant Pages

  • Re: lorenz transformation and spped of light
    ... lorenz transformation says that their relative speed perception is ... SR is not about perceptions and illusions. ... Why cannot the reality be that of two spacecrafts running at ... Make it the speed relative to the fixed stars. ...
    (sci.physics)
  • Re: lorenz transformation and spped of light
    ... It not a "perception" .. ... Why cannot the reality be that of two spacecrafts running at ... of each spacecraft can compute its absolute ... Both spacecrafts send light signals to each other. ...
    (sci.physics)
  • Re: lorenz transformation and spped of light
    ... It not a "perception" .. ... So we know what the reality is. ... it take to receive signals from the other spacecraft. ... Each pilot, of each spacecraft can compute its absolute ...
    (sci.physics)
  • Re: lorenz transformation and spped of light
    ... Of course it's a perception, ... That's the reality in one frame of reference. ... measured by the other real spacecraft. ... Each pilot, of each spacecraft can compute its absolute ...
    (sci.physics)
  • Re: lorenz transformation and spped of light
    ... It not a "perception" .. ... Why cannot the reality be that of two spacecrafts running at ... of each spacecraft can compute its absolute ... so there are as many speeds ...
    (sci.physics)
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