sci.physics.relativity

On Mar 3, 8:26=A0pm, xxein wrote:
> On Mar 3, 3:29=A0pm, "Sue..." wrote:
>
>
>
>
>
> > On Mar 3, 1:19=A0pm, Albertito wrote:
>
> > > In 1893 Ernst Mach stated the so-called Mach Principle:
> > > =A0 =A0 =A0 =A0 =A0"For me only relative motion exists. When a body ro=
tates
> > > =A0 =A0 =A0 =A0 =A0relative to the fixed stars centrifugal forces are =
produced.
> > > =A0 =A0 =A0 =A0 =A0When it rotates relatively to some differ=ADent bod=
y but not
> > > =A0 =A0 =A0 =A0 =A0relative to the fixed stars, no centrifugal forces =
are
> > > produced.
> > > =A0 =A0 =A0 =A0 =A0I have no objection to calling the first "rota=ADti=
on" as long
> > > as it
> > > =A0 =A0 =A0 =A0 =A0be remembered that nothing is meant except relative=
rotation
> > > =A0 =A0 =A0 =A0 =A0with respect to the fixed stars."
>
> > > Now I ask, for two inertial clocks, A and B, moving relatively one
> > > wrt
> > > the other at speed v>0, SR claims A runs slower than B in the frame
> > > of reference where B is at rest, but SR also claims that B runs
> > > slower
> > > than A =A0in the frame of reference where A is at rest. So, which cloc=
k
> > > runs actually slower than the other? =A0The answer is simple: that
> > > clock
> > > that moves faster wrt to fixed stars is running slower than the
> > > other.
>
> > << =A0SR does not incorporate Mach Principle, and that's a serious flaw!=

>
> > The existance of a Machian background presents no
> > problem to the resolution of:
>
> > 1. =A0All inertial frames are totally equivalent for the
> > =A0 =A0 performance of all physical experiments.
>
> > 2. =A0the speed of light must be the same in all inertial frames.
>
> >/teaching/jk1/lectures/
>
> > It is Newton's inertial ether and Newton's particle
> > light that present the problem. =A0Where in SR do you
> > find those concepts "cast in stone" ?
>
> >/173/
>
> > Sue...- Hide quoted text -
>
> > - Show quoted text -
>
> xxein: =A0Why can't you simply use Einstein's words in describing his
> postulates? =A0Is your concept different than his?

Perhaps it is:

<<
Special Relativity Postulates
According to Einstein
1. Relativity principle: The laws of physics
have the same form in all inertial reference frames.

2. Constancy of speed of light: Light propagates
through empty space with a definite speed c independent
of the source or observer. >> --
/www/classes/p139/

In the quote taken from the utexas pages, the reference
to an inertial frame in the light speed postulate prevents
the assumption of particle light moving under the influence
of inertia.

So it reflects the modern view of light propagation,
a concept that would have been rejected by many adherents
to Newton's corpuscular concept of Einstein's time.

<that the Academy recognised the particle
nature of light? The Nobel Committee says
that Einstein had found that the energy exchange
between matter and ether occurs by atoms emitting
or absorbing a quantum of energy,hv .

As a consequence of the new concept of light quanta
(in modern terminology photons) Einstein proposed the
law that an electron emitted from a substance by
monochromatic light with the frequency has to have
a maximum energy of E=3Dhv-p, where p is the energy needed to
remove the electron from the substance. Robert Andrews
Millikan carried out a series of measurements over a
period of 10 years, finally confirming the validity of this
law in 1916 with great accuracy. Millikan had, however,
found the idea of light quanta to be unfamiliar and strange.

The Nobel Committee avoids committing itself to the
particle concept. Light-quanta or with modern terminology,
photons, were explicitly mentioned in the reports on
which the prize decision rested only in connection with
emission and absorption processes. The Committee says
that the most important application of Einstein's photoelectric
law and also its most convincing confirmation has come from
the use Bohr made of it in his theory of atoms, which explains
a vast amount of spectroscopic data. >>
/physics/articles/ekspong/


Sue...