🚀 go-pugleaf

On Jun 9, 8:43 am, Pentcho Valev <pva...@yahoo.com> wrote:

<...>

> It follows from Einstein's 1905 false light postulate that an
> infinitely long object can be trapped inside an infinitely short
> container. So Einsteinians can gloriously obtain any decrease in the
> object's volume:
>
> http://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. Now someone takes the pole and tries to run (at nearly the
> speed of light) through the barn with the pole horizontal. Special
> Relativity (SR) says that a moving object is contracted in the
> direction of motion: this is called the Lorentz Contraction. So, if
> the pole is set in motion lengthwise, then it will contract in the
> reference frame of a stationary observer.....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. The
> runner emerges from the far door unscathed.....If the doors are kept
> shut the rod will obviously smash into the barn door at one end. If
> the door withstands this the leading end of the rod will come to rest
> in the frame of reference of the stationary observer. There can be no
> such thing as a rigid rod in relativity so the trailing end will not
> stop immediately and the rod will be compressed beyond the amount it
> was Lorentz contracted. If it does not explode under the strain and it
> is sufficiently elastic it will come to rest and start to spring back
> to its natural shape but since it is too big for the barn the other
> end is now going to crash into the back door and the rod will be
> trapped in a compressed state inside the barn."

A man of your evident scholarship is hung up on the barn-pole paradox?
Amazing.

> It follows from Einstein's 1905 false light postulate that an
> Einsteinian travelling with the rivet sees the bug squashed. The bug
> sees itself alive and kicking:
>
> http://hyperphysics.phy-astr.gsu.edu/Hbase/Relativ/bugrivet.html
> "The bug-rivet paradox is a variation on the twin paradox and is
> similar to the pole-barn paradox.....The end of the rivet hits the
> bottom of the hole before the head of the rivet hits the wall. So it
> looks like the bug is squashed.....All this is nonsense from the bug's
> point of view. The rivet head hits the wall when the rivet end is just
> 0.35 cm down in the hole! The rivet doesn't get close to the
> bug....The paradox is not resolved."

Light speed signals from the rivet head are insufficient to overtake
and stop the end of the rivet before it hits the bottom of the hole.
Geez.