Re: Closing speed vs relative speed for dummies

Dr. Henri Wilson a écrit :
On Mon, 23 Feb 2009 12:45:18 +0100, YBM <ybmess@xxxxxxxx> wrote:

Dr. Henri Wilson a écrit :
On Mon, 23 Feb 2009 01:48:05 +0100, YBM <ybmess@xxxxxxxx> wrote:

Dr. Henri Wilson a écrit :
Well let's do it another way.

Let there be TWO light sources and two observers. O1 moves inertially at v
towards S1 and O2 moves at v wrt S2.

We have:
...............(S1-------------------------------v<-O1)
(S2-------------------------------v<-O2)

Irrespective of how each system moves wrt a third observer, the 'closing speed'
of S1's light on O1 is c+v, as is that of S2's light on O2.
Ralph, Ralph... Closing velocity of two objects is always defined by a
given observer who simply add the velocities of both objects with
respect to him.
wrong.
You do exactly the same error you've been doing with all your stupid
Visual Basic programs for years: you assume a absolute space
background...

What a moron. All the speeds in the above experiment are specified as relative.

Really?

" *Irrespective of how each system moves wrt a third observer*, the
'closing speed' of S1's light on O1 is c+v "

What would be the closing speed between S1's light and O1 for:
- an observer comoving with O1
- an observer comoving with S1

Are they the same?
.

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