Re: Reviewing Statements in Einsteins 1905 paper.

On Jan 15, 11:15 am, G <gehan_ameresek...@xxxxxxxxxxx> wrote:
On Jan 15, 8:58 pm, G <gehan_ameresek...@xxxxxxxxxxx> wrote:



On Jan 14, 8:58 am, "Jeckyl" <no...@xxxxxxxxxxx> wrote:

"G" <gehan_ameresek...@xxxxxxxxxxx> wrote in message

news:10d3239a-1b2f-4924-b931-faf2eda0641c@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

On Jan 13, 8:08 am, Dono <sa...@xxxxxxxxxxx> wrote:
On Jan 12, 6:31 pm, G <gehan_ameresek...@xxxxxxxxxxx> wrote:

My question is this:

Don't the Lorentz equations apply only within reference frames and not
between moving FoRs?

What gave you that bright idea? Because you are saying something
utterly dumb.

I apologize for not stating the question clearly.

Do Maxwell's equations, which establish a wave theory of the
propagation of light, necessarily mean that light travels at the same
velocity in all frames? Or did it need additional assuptions?

As I understand, given the PoR (postulate one of SR), they do.

eg.http://www.wbabin.net/yuri/keilman3.htmhttp://en.wikipedia.org/wiki/P...

However, although one could show a constant speed of light from Maxwells
equations and invariance of charge, SR does not depend on them directly.

AH. direct answer to my posts. Thanks

Just to be clear, AE "wondered what it would be like to chase a light
beam" . This seems to be the reasoning: an electromagnetic wave
travels at a velocity c , in a coordinate system in which the observer
and the source is located, and the source and observer have a relative
velocity = 0.

Now the observer gets into a fast rocket and tries to chase the beam
of light. He never catches up, because the equations are now applied
to his own frame as if the source was in his frame. An the equations
rule, the equations say that light will travel at c.

Or take two fast cars. One speeds past the other at a traffic light.
The second car catches up to the first , and the drive glances over.
"Can I ask you a question?" He asks. "Your car can travel at 200 kmh
and my car can travel at 200 kmh when we push the pedal all the way
to the floor. We have booth floored the gas pedals but you are not
moving at all? How is it you are not moving when your car travels at
200 kmh with the pedal to the metal? We must abandon either the teory
of relativity, so beautiful and complete, or we must abandon the
theory that your car and indeed my magnificent car travel at 200 kmh?

My question is: Is this the kind of reasoning AE is using to prove
that Maxwell's equations mean that the speed of light is the same
no matter how fast one is moving relative to anything?

At this point are you saying that because Maxwells equations specified
that light travels at c in where the observer and source
are not moving relative to each other, it means that light travels at
c when the source and light are moving at a relative velocity with
respect to each other?

G

I think I found the answer

1. First Postulate (Principle of relativity)

Every physical law is invariant under inertial co-ordinate
transformations. Thus, if an object CAR in spacetime obeys the
mathematical equations describing a physical law in one inertial frame
of reference, THE CAR it must necessarily obey the same equations when
using any other inertial frame of reference.

Therefore cars travel at 200kmh in all frames of reference

Yes, if you add this unphysical law to physics, relativity
would require it to be true in all frames.

However, there is no object in physics called CAR
which is required to travel at 200 kph.

- Randy
.

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