Re: Rest mass


----- Original Message -----
From: "Darwin" <drosen0000@xxxxxxxxx>
Newsgroups: sci.physics.relativity
Sent: Wednesday, July 18, 2007 4:44 PM
Subject: Re: Rest mass


On Jul 14, 4:08 pm, va...@xxxxxxxxxxx wrote:
On 13 jul, 13:15, "Sue..." <suzysewns...@xxxxxxxxxxxx> wrote:

On Jul 13, 2:40 pm, va...@xxxxxxxxxxx wrote:

In SR rest mass is a constant and intrinsic attribute of a body, I am
claiming that derived from 1905 Relativity, rest mass is a measure of
the absolute potential energy of a body, being variable with position
in a field.

RVHG (Rafael Valls Hidalgo-Gato)

The potential energy is actually stored in the field not in the
particle.

Unless the field is non-static can you assign a location to the energy. In
static situations (E.g. a charged particle in a uniform time independent
electric field) there are several views which may be chosen to think of
where the energy is. It is unfortunate that EM texts rarely explain this in
detail so I suspect that's why most people don't know the details as of
where and why. An EM text that *does* get into this is "The Electromagnetic
Field," by Albert Shadowitz, Dover Pub. It would be difficult to locate
where in the text this is discussed but if there is a person out there who
would like to read it then just say so and I'll find it no matter what and
scan the page and post that page on the web under my website and then post a
link to that page. Anybody interested in this?

Potential energy of position has an arbitrary value and internal potential
energy has a unique value. Take as an example a uniform field parallel to
the x-axis. This means that the field has the same value for all x. If you
were to measure the acceleration of the body at x = 0 with speed v = 0.5c
then it would have the value a_o. But if you now placed it at x = 10^6 with
a speed of v = 0.5c then since the electric field has the same value there
the acceleration would still be a_o. If the acceleration of a two different
bodies at the same speed has the same rate of change on momentum then the
mass of each body is identical to the mass of the other body. What baffles
me is why someone hasn't mentioned this obvious fact before????


Pete


.

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