Natural Science Forum / Physics / Relativity / July 2009

Einstein's P2 has two parts. The first says that all observers will measure the
one-way speed of arriving light (if that is possible) as always having the
value c. Of course, this has never been verified.
The second adds that this speed is independent of the relative motion of the

Here is an extract from a well known text, "Quantum Mechanics" by C. Cohen-Tannoudji, B. Diu and F. LaLoe:
http://sb635.mystarband.net/cohen.pdf
The plate P which has the slits is conceptually on perfect springs, and the movement of the plate provides a measure of momentum. I
was ...

The thread "There is no physical length contraction" is getting too
long to be coherent, IMHO, although very interesting.
I would like to focus on the nature of the connection between the two
spaceships in Bell's Spaceship Problem/Paradox:  I believe it has

The origin of micro Comets and Ball lightning.
(What goes DOWN sometimes goes UP)
25 years ago during heavy thunderstorm in the Netherlands, a photo
camera with automatic shutter recorded strange bead lightning streaks

A while back there was a discussion in this newsgroup regarding
Einstein's interpretation of gravity. Steve Carlip forwarded a counter
argument which employed commoving coordinates. I'm hoping someone,
perhaps even Steve if he has the time and inclination, can recall

sniffing around a bit, i came to
feel the conclusion that
from outside i can empirical measure
1. speed of muon higher than c

Dear Colleagues and friends,
The University of Minho, in Portugal and Dare Institute in Cambridge,
MA are inviting potential participants from various backgrounds for
an

I have some questions about the michelson morley experiment that tried
to detect ether.
On this web page http://galileoandeinstein.physics.virginia.edu/lectures/michelson.html
it shows some of the mathematics involved in calculating the

Whenever this subject is raised, relativists immediately throw a tantrum and
pretend to have some kind of brain seizure. They then quote Einstein's second
postulate as proof that light speed is source dependent, claiming that the
mathematics works and that's all we need to know.  

I got this idea from watching a sink full of water draining, well,
down the drain. The water formed a spiral pattern. I realized the
spiral structure was created only because that was the most efficient
manner for a large amount of water to drain down a small hole. I

"H.E.Retic Postings and SPAM"
    (See also our sister website reticsessays.com)
    There have been multiple accusations that the postings of H.E. Retic
are SPAM. The writer's postings are carefully constructed so as remain

What are the spatial dimensions of a *volumeless* object having
mass and charge?
If they are zero, how can such object be different from a mathematical
point?

Wikisource has a lot of historical papers on Einstein's theory of
special relativity by Michelson, Lorentz, Poincaŕe, etc.. See:
http://en.wikisource.org/wiki/Wikisource:Relativity
For example,

if i feel right, the predictors at the
Collider dont use the addition in their neutrons
or whatever, because there are no additions in relativity
what is going on here,

Assume that modern GR holds. That means that change of gravity will
move at the same speed as the speed of light in vacuum.
Given a black hole and an observer at a safe distance, do the
following experiment: Continuously add mass to the black hole. That