Natural Science Forum / Physics / Relativity / March 2005

An atmospheric wind will decrease the trip frequency of an
oscillating aircraft and pin a dragonfly to the grill of a moving
automobile.
An dielectric wind will decrease the bounce frequency of

This is a straightforward question on relativity rudiments.
I profess my ignorance of the exact answer.
BACKGROUND:
If my space ship is sitting still in space and another craft/frame is in

Can anyone explain to me what is meant by the covariant and contravariant
indices of a mixed tensor?
In particular, I can't  understand why it is that the covariant index
transforms with the basis and the contravariant index transforms against the

There might be hundreds of questions about time dilatation like this,
but I couldn't find a similar problem in the groups.
Suppose a rocket A travels with v=4/5c for 5 years (y) from earth to a
planet (in rest relatively to earth) which is 4 light years (cy) away

Is all motion relative? This is a programatic question.
So, what do you commit to: The earth really orbits the sun or that that
is a model being one of many possible models of which the reality of
any of them is indeterminable in physics. This begs the question of the

"Ken S. Tucker" <dynam...@vianet.on.ca> writes:

Axiom: Time is a succession of events (a logic device created by man)
Axiom: Events are absolute
I can't believe that time is not absolute.  Time is a succession of
absolute events.  For example, if one day you walk in your office and

The following is based on 3d volume but why 3d and not 200d? any how
.........
A big bang, magnetic, electric, solar field perhaps may all be similar
in the aspect where their 3d singularity (GR) can be cross-sectioned

Facts and Rules for SR Transforms!
Fact 1.
  All inertial reference frames, at least
theoretically, can be extended, both in time and

At present, there is no supportable rationalization regarding the
fundamentals of time or gravity.  Mankind clearly observes that both do
exist; yet we do not understand how or why. Newton's Law of gravity is still
utilized in modern time, despite it being over 300 years old. ...

An RF signal is emitted by an antenna. It's frequency is nu and its speed
relative to the antenna is c.
The 'frequency' refers to the 'number of wavecrests' emitted per second.
If an observer who is moving wrt the source intercepts the signal, any change

I was always uneasy about the definition a la Mach of an inertial
reference frame as "not accelerating with reference to the distant
stars".
Clearly we know that astronomical objects do not fit in inertial

Terri Sciavo is the precedent for mass murder.
The government is going to kill them. They can
because they would be liberated from those people
who still have morals.

I read recently that if you go into the throat of the gravity well of a
black hole, you might (if you survived), be ejected into another universe
via the anti-gravity white hole.
I'm not at all sure about this - we must remember that the gravity well

What are the relatively effective ways of looking busy without work?
And what are the relatively painless and cheap means of suicide?