Re: What Hath Einstein Writ?

["Prof. John P. Ertel (wizard)" <jpe@NADN.NAVY.MIL>]

A proper statement of N2L (Newton's 2nd Law) should reflect time
rate of change of the rectilinear momentum (not just F=ma), i.e.

        ( _  __  )      (     )
        ( \ |_   )      ( d P )
        ( / |    )  ==  (-----)
        ( -   ext)      ( d t )
        (        )4     (     )4

It would seem that a proper relativistic treatment should retain this
classical feature or Albert may spin smartly about his longitudinal axis.
The real question in both SR and GR is how to best include this classical
feature while adequately explaining features that only significantly
appear at relativistic speeds or in a domain in which the gravitational
field is high(er).  This is the real challenge!  It is the origin of the
search for a proper metric which may Unify all.

On Tue, 22 Feb 2000, Zach Wolff wrote:

> > Please correct any errors in the following, as I speak
> > with only a little knowledge.
> >
> > I had come to understand that ALL mass is
> > relativistic.  The rest mass of the proton doesn't
> > come from the rest mass of its constituent quarks, but
> > from the energy binding them.  I had understood that
> > this is true for most other particles we deal with.
> >
> > I had thought of mass as a constant in equations like
> > F=ma, where mass represents a resistance to
> > acceleration.  If moving objects have a higher
> > resistance to acceleration, it seems that they have a
> > higher mass.  I think the iceberg story makes sense.
> > An object at a higher temperature has more mass than
> > the same object at a lower temperature.
> >
> > Naively,
> > Zach
> > __________________________________________________
> > Do You Yahoo!?
> > Talk to your friends online with Yahoo! Messenger.
> > http://im.yahoo.com

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