Natural Science Forum / Physics / Relativity / December 2008

To all you gentlemen who believe that longitudinal length contracts,
momentum/mass increases and time slows in a fast moving coordinate
system --.
WRONG!

In special relativity, although the speed of light is constant, the
velocity (speed and direction) depends on the velocity of the light
source (unstated, but necessary premise).  Does the propagation of
gravity also depend on the velocity of the source?  If so, how is the

Another question i dont understand from our teacher
If relativity is so good, and accordingly, you can put a large train
into a small tunnel
whi relativity does not apply in industry, whereas often you need to

Hi, some days ago i read a thought about a particle doing a loop in
time and use it for computation, as hobbyist, not a phd, that make me
link some ideas and i want to read what you (phds) think.
As the original post says, if the time traveling is possible, then

Have couple of questions on conservation of energy I hope to get resolved:
Consider a simplified universe with only one huge mass M and one tiny
mass m in relative motion at sufficient distance that gravitational
effects can be disregarded.

All,
The Hubble expansion though it is of space itself still imparts
relative velocities to masses on the cosmological scale therefore it
increases the amount of kinetic energy in the universe since as glaxies

This is a simple way to think of coordinates for some of our
scientific friends.  See, there is an x axis and a y axis and a
z axis.  So if we have an equation that says
               x^2 + y^2 + z^2 - c^2t^2 = 0

Dimitri Nanopoulos (who chairs the Theoretical Physics
Division of the Academy of Athens, Distinguished Professor
of Physics at Texas A&M University and heads the Houston
Advanced Research Center's Group for Astroparticle Physics)

True or false:
1)   The electric field due to a moving point charge is directed
toward the instantaneous position of the charge.
2)   The direction to view a moving light source is directed toward

"Is String Theory Justified?"
    (See also our sister website reticsessays.com)
    The holy grail of theoretical physics seems to be the generation of a
"theory of everything". It is the goal to generate a single set of equations

Amazingly I just learned (but I dont understand) that in Relativity
Reference Frames exists without LIFE, BRAIN ACTIVITY, CONSCIOUSNESS,
and hereby OBSERVER(S)
So they must exists really independent from anything

I have recently been reading about experiments designed to observe
"terrestrial aberration".  The idea as I understand it is to observe a
relative motion of space-time with respect to the laboratory (some
authors call such motion 'absolute' for reasons unclear to me).

TEST

I devised a simple length contraction experiment. However when I do
the experiment I don't get Einstein's result.  Admittedly, my
experiment is rather simple, and there is uncertainty in some of the
measurements and I simulate part of the physical interactions, but I

Physicists and Laws.
Physicists do not dictate to Nature their laws.
Laws of nature are reality, which exists independently
from the researcher. The Nature cannot be arranged so