Re: [escepticos] Inercia

["Javier Susaeta" <avusrb@...>]

> From: Eloy Anguiano <eloyang en teleline.es>
> Reply-To: escepticos en ccdis.dis.ulpgc.es
> To: escepticos en ccdis.dis.ulpgc.es
> Subject: Re: [escepticos] Inercia
> Date: Fri, 14 Dec 2001 22:52:49 +0100
>
> Javier Susaeta wrote:
>
> > (...)

> > Gira respecto a las 'masas distantes del universo', que decía Mach,
> > porque en su tiempo no se conocía la naturaleza de las galaxias y se
> > las llamaba, así en general, 'nebulosas'. Modernamente, se habla de
> > las 'galaxias distantes del universo.
>
>
>
> Uffff, esto me suena al Alfísica.
> No hombre, gira respecto a cualquier sistema inercial.
>
>
> > Y no es que lo diga yo, que lo dicen también -aunque más finamente,
> > claro- Mach, Einstein, Wheeler, Feynman, Misner, Thorne, Ciufolini...
>
>
> Lo siento pero Einstein decía exactamente todo lo contrario.

No. Mira lo que dice Einstein en 'The Principle of Relativity' Princeton 
Science Library Edition, 1988, pág 100:

(...)the theory of relativity makes it appear probable that Mach was in the 
right road in his thought that inertia depends upon a mutual action of 
matter. For we shall show in the following that, according to our equations, 
inert masses do act upon each other in the sense of the relativity of 
inertia, even if only very feebly. What is to be exopected upon the line of 
Mach's thought?

1. The inertia of a body must increase when ponderable masses are piled up 
in its neighbourhood.

2. A body must experience an accelerating force when neighbouring masses are 
accelerated, and in fact, the force must be in the same direction as that 
acceleration.

3. A rotating hollow body must generate inside of itself a "Coriolis field" 
which deflects moving bodies in the sense of the rotation, and a radial 
centrifugal field as well.

We shall now show that these three effects, which are to be expected in 
accordance with Mach's ideas, are actually present according to our theory, 
although their magnitude is so samll that confirmation of them by laboratory 
experiments is not to be thought of. (...)
*****************

Fíjate en la similitud de lo del cuerpo hueco rotatorio con lo de las 'masas 
distantes del universo' en que tanto insisto. Ellas no giran. Gira el cubo 
respecto a ellas. Pero el efecto es el mismo.

Saludos

Javier



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