Re: Pound Rebka

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Article #16331

#16331

From: Randy Poe
Date: Wed, 09 Jan 2008 21:04

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On Jan 9, 3:20 pm, Koobee Wublee <koobee.wub...@gmail.com> wrote:
> On Jan 9, 11:35 am, Randy Poe <poespam-t...@yahoo.com> wrote:
>
> > On Jan 9, 2:13 pm, Koobee Wublee <koobee.wub...@gmail.com> wrote:
> > > You can repeat to yourself whatever amount of time you want, but the
> > > end of the day the equation (E = m c^2) is valid at all conditions if
> > > m is interpreted as the observed mass.
>
> > How do you observe this mass?
>
> Since (E = m' c^2), by observing the energy, you can get the observed
> mass.  <shrug>

So what you mean by "observed mass" is "the observed
mass is defined to be" E/c^2. It's a little vacuous to state
that E = m'c^2 is valid at all conditions since you are using
it to define m'. As it turns out, for particles with rest mass
your m' is equal to gamma*m, and for photons it is equal
to p*c.

One problem with this m', formerly called "relativistic mass",
is that it does not correspond to the gravitational mass.

Now, how are you saying that your equation E = m'c^2 is
right all the time, and m' = gamma*m, but E = gamma*mc^2
is wrong?

                 - Randy

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From: Randy Poe <poespam-trap@yahoo.com>
Newsgroups: sci.physics, sci.physics.relativity, rec.org.mensa, 
 fr.sci.physique, sci.astro
Subject: Re: Pound Rebka
Date: Wed, 9 Jan 2008 13:04:46 -0800 (PST)
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