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Re: [Phys-l] definitions ... purely operational, or not



True weight is mg ...

The problem with this definition is that mg is the force measured on a ROTATING earth.

g ≠ GM/R^2

"Although the symbol g is sometimes incorrectly used for standard gravity, g (without a suffix) strictly means the local acceleration due to local gravity and centripetal acceleration, which varies depending on one's position on Earth (see Earth's gravity)."

http://en.wikipedia.org/wiki/Standard_gravity