🚀 go-pugleaf

On 30 Mar, 07:24, Pentcho Valev <pva...@yahoo.com> wrote:
> On Mar 30, 4:59 am, Tom Roberts <tjroberts...@sbcglobal.net> wrote in
> sci.physics.relativity:
>
>
>
>
>
> > maxwell wrote:
> > > Can anyone provide a peer-reviewed reference to any experiment that
> > > demonstrates the reality of the Lorentz contraction of a real physical
> > > object & not just a CALCULATED length between two events?
>
> > I strongly doubt it. I have looked.
>
> > There are indirect measurements of this (e.g. the magnetic field of a
> > straight wire). This is most definitely required for self-consistency.
> > But AFAIK it has never been directly measured.
>
> > > If not, then SRT is only about redefining TIME and length contraction
> > > is just a mere consequence of using light as the 'measuring stick'.
>
> > This is nonsense. Our current inability to perform a sufficiently
> > accurate measurement of one aspect of the theory does not negate any
> > part of the theory. Many other aspects of the theory have been verified
> > to extremely high accuracy, and within its domain of applicability, no
> > reproducible experiment has refuted SR.
>
> > Tom Roberts
>
> Has it ever occurred to you, Honest Roberts, that special relativity,
> as well as any other inconsistent theory, can be refuted by using a
> procedure that logicians call REDUCTIO AD ABSURDUM? For instance, if
> one derives from the postulates of the theory that the long train is
> short (if trapped inside a short tunnel), that the 80m long pole is
> 40m long (if trapped inside a 40m long barn and Einsteinians have
> forgotten to reopen the doors of the barn "pretty quickly"), and that
> the bug is both dead and alive, then some of the postulates (e.g.
> Einstein's 1905 light postulate) must be false:
>
> http://www.youtube.com/watch?v=VSRIyDfo_mY&mode=related&search=
>
> http://www.math.ucr.edu/home/baez/physics/Relativity/SR/barn_pole.html
> "These are the props. You own a barn, 40m long, with automatic doors
> at either end, that can be opened and closed simultaneously by a
> switch. You also have a pole, 80m long, which of course won't fit in
> the barn....So, as the pole passes through the barn, there is an
> instant when it is completely within the barn. At that instant, you
> close both doors simultaneously, with your switch. Of course, you open
> them again pretty quickly, but at least momentarily you had the
> contracted pole shut up in your barn."
>
> http://hyperphysics.phy-astr.gsu.edu/Hbase/Relativ/bugrivet.html
>
> Pentcho Valev
> pva...@yahoo.com- Hide quoted text -
>
> - Show quoted text -

What's the problem?

In the frame of the switch, the two barn doors closing and quickly
opening to enclose the pole are simultaneous, whereas in the frame of
the pole they're not.