Re: SR's velocity addition -- ANY Experimental Evidence?

From: Jim Greenfield (greenfield_7_at_hotmail.com)
Date: 07/15/04 

Date: 14 Jul 2004 23:55:41 -0700

Timo Nieminen <timo@physics.uq.edu.au> wrote in message news:<Pine.LNX.4.50.0407151107400.19923-100000@localhost>...
> On Thu, 14 Jul 2004, Jim Greenfield wrote:
>
> > Timo Nieminen <timo@physics.uq.edu.au> wrote:
> > > On Wed, 13 Jul 2004, Jim Greenfield wrote:
> > >
> > > > It takes a body moving
> > > > at constant speed on a given heading (vector), and "changes" that
> > > > heading without thought to the energies required to bring about the
> > > > altered direction.
> > >
> > > Since nothing physically changes when the coordinate system is changed,
> > > why would any energy be required? (Although better to say "force" rather
> > > than "energy" since heading can be changed without any change in energy.)
> > >
> > > Here is a simple example:
> [cut]
> >
> > Airplane fires rocket forward (on same axis): rocket fires bullet
> > forward (STILL on same axis). ALL are still in the same coordinate
> > frame, and going in the SAME direction. If you wish to change
> > coordinates for any or all three, and make claim that you have
> > magically altered the headings of some ref others, go ahead! When
> > someone shifts the goal posts, it is called "cheating", and in this
> > case, not even subtle.
>
> Lorentz transformations are linear transformations. If the velocities are
> colinear in one inertial coordinate system, they differ only by a (real)
> multiplicative factor. This won't be changed by any linear transformation,
> so, according to SR, as well as Galilean relativity, all three velocities
> are colinear in all inertial coordinate systems.
>
> So what is the relevance of your comment above?
>
> Lack of any reply directly related to previous post noted. Are you capable
> of dialogue?

How speeds are added as "slopes" was explained to me in detail by
George Dishman. "Colinear slopes" is an oxymoron, so I must take it
that you strongly disagree with him.

As you are keen to apply LT's, I will ask once more: as distance is
NEVER negative (less than zero), how can VELOCITY be??????

Jim G
(having trouble having dialogue with an ideolog)