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Re: [Phys-l] Weightless

Note that GmM/r^2 is only valid for a spherically symmetric distribution of matter.

On the surface of the earth one has many asymmetric components as well as variation in r and

the effect of rotation.

The "gravitational anomaly" is used to probe the variation of g due to local density variations, etc.

In another direction, "microgravity" seems to be the term used for "almost weightlessness",

eg flight in the "vomit comet".