Posted by Alex on Monday, December 5, 2011 at 11:37pm.
The "normal force" is the measured weight.
Gravitational force MINUS weight equals the centripetal force, M V^2/R
where R is the radius of the Earth and V is the Earth rotational velocity at the equator, 464 m/s
For a 100 kg object, the difference is
100*(464)^2/6380*10^3 = 3.8 N
which is about 0.85 pound.
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