Re: Proper quantities in SR

On Jul 4, 5:37 am, "Jeckyl" <n...@xxxxxxxxxxx> wrote:
[...]

<< It is clear that dt = d_tau in the particle's rest frame.
Thus, d_tau corresponds to the time difference between
two neighbouring events on the particle's world-line, as
measured by a clock attached to the particle (hence,
the name proper time). According to Eq. (1422), the
particle's clock

----> appears <-----


to run slow, by a factor gamma(u), in an
inertial frame in which the particle is moving with velocity u.
This is the celebrated time dilation effect. >>
http://farside.ph.utexas.edu/teaching/em/lectures/node114.html
...Contrary to your arrogant assertions that something
more is afoot than a mere path delay
It is more than path delay .. it is NOT an illusion .. time runs slower
in
relatively moving frames tha ones own frame.

Do you think time runs slower for for the pigeon racer?



J: << From the frame of someone not comoving with him, yes >>

Hint: Mass moving in one inertial frame has different
kinetic energy than equivalent mass moving relativly
to that frame.

That difference in energy is most easily represented
with an imaginary time because time is a symmetry
partner with energy.

http://www.bartleby.com/173/15.html
http://en.wikipedia.org/wiki/Noether's_theorem

The imaginary time is no different than measuring
current and voltage of an induction motor at imaginary
times so we are not fooled into thinging the motor
makes energy because of its *apparent power*.
http://en.wikipedia.org/wiki/AC_power
http://www.bartleby.com/173/17.html

To say *time is different* in another frame or
the "clock really slows" is equivalent to thinking
Michael Jackson could live longer sleeping in
a big solenoid because the time is different there.

So the expressions "as judged from K" (Einstein) or
"appears to slow" (R. Fitzpatrick) are both correct
expressions and they don't seem be from some sort of
spooky or cranky web pages as you keep suggesting.

<< McDonald Observatory and the University of Texas
McDonald Observatory operates in association with
the Department of Astronomy, and is one of the world's
leading centers for astronomical research, education
and public outreach. The activities of the faculty and
staff span virtually all areas of modern astronomy.
Located in the Davis Mountains of west Texas, the
observatory accommodates more than 100,000 visitors
each year, offering activities and programs for every
level of interest. >>
http://www.as.utexas.edu/

Sue...

.

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