Re: coordinates and equations.

rbwinn a écrit :
On Nov 28, 9:20�am, PD <TheDraperFam...@xxxxxxxxx> wrote:
On Nov 28, 9:21�am, rbwinn <rbwi...@xxxxxxxx> wrote:





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
where x, y, and z are coordinates, and t is time on a clock in S, the
frame of reference, and c is the speed of light, then if you
substitute numerical values into the equation, what you end up with is
a sphere with a radius of ct with its center at the origin of S.
Now we will do the same thing with another set of coordinates S'.
� � � � � �(x')^2 + (y')^2 + (z')^2 - c^2(n')^2 = 0
where n' is the time on a clock in S'.
That's interesting, Bobby, but if you use t as a variable to denote
what a clock reads, then a more sensible notation is t for the time
read on a clock stationary in S, and t' for the time read on a clock
stationary in S'. If you prefer to use n' for the clock reading in S',
I suppose that's your prerogative. Would you care to use f'' for the
clock reading in S'', and u''' for the clock reading in S'''?
Well, you are getting a little ahead of the conversation, PD. Why
don't we just let individual people decide what veariables they will
use, since I am the only person who uses these variables anyway?

�Scientists have told us that
according to scientific experiments, light is traveling at c=300,000
km/sec according to a clock in S'. �So what we end up with here is a
sphere with a radius of c(n') with its center at the origin of S'.
� �I hope this will help some of our scientific friends to understand
how light propagates. �I know it is confusing to them because there is
no length contraction in these equations.
Certainly there is. What do you think the relationship between x and
x' is?

x'=x-vt

Did you think that length contraction would mean light wouldn't
propagate in a sphere with radius c x time?

Maybe it would help to learn what it is that relativity actually says,
Bobby.- Hide quoted text -

Well, according to Dr. Albert Einstein, the light would propagate in
S' as an oblate spheroid as seen from S because of the length
contraction.
Are you saying that Dr. Albert Einstein was wrong?

Neither Dr. Einstein nor Lorentz Transformation say that. As a matter
of fact it is quite easy for everyone (but a cretin like you) to
show from LTs that isotropy of light propagation in S imply
isotropy in S'.

You don't need to show us again that you don't know what "length
transformation" means in SR, we know that for years. You'd better
try to realize that you don't know what it means by realizing by
yourself that spherical light front in S implies sperical light
fron in S' in the context of Lorentz Transformation.

Could you do it ? This is childish algebra.

.

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