On Sun, 15 Oct 2000, Daniel Bishop wrote:
> ...
> The rotation of the earth does affect the apparent weight of objects,
> but can be calculated using only the real forces...
Daniel,
The ISO definition depends on the "local acceleration of free
fall" which is an *observed* (measured) quantity in the *selected* frame
of reference, whether it be inertial or rotating. Thus, weight is a
measured quantity in the particular reference system selected, *not* a
calculated value (beyond application of f = m.a in its most simple form).
The apparent weight from the free fall measurement is *the*
weight by the ISO definition. No further calculations (beyond f = m.a)
are necessary or appropriate.
Gene.
