Variation of g with rotation?

Question

I am not able to understand the variation of g with rotaion. where from the omega square comes? please explain elaborately.

Answer 1

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Is this about variation of g on the surface of the earth due to the earth's rotation?

No, g does not vary due to rotation. But some of the force of gravity is offset by the outward force due to the rotation. This apparent variation in g is a maximum of 0.3% at the equator.

omega square? do you mean ω² ?
as in:
acceleration (outward) at rim is a = rω² ?

Source(s):

http://en.wikipedia.org/wiki/Gravity_of_…

Answer 2

Omega is actually the rotational speed which occurs because of the centripetal pressure. g(gravity) is really a constant amount at fixed range from the middle of the planet earth.

Source(s):

http://www.tutordynamic.com/physics.htm