Though you can simulate 'artificial gravity' in, say, a rotating space craft (like Kubrick's double-wheel), the speed of the Earth's rotation is
not related to gravitational effects.
It's tempting to compare the Earth to a spinning record turntable or something but it doesn't work that way.
There is -some- acceleration due to centripetal force, but it's very small compared to gravity.
Gravity on Earth=32 feet per second, per second (or 9.8m/s/s).
Centripetal force on Earth due to the Sun's gravity=0.01 fps/s (or 0.006m/s/s)
One way to look at it is things don't change in weight as you get to the north pole where there is no rotation.
For
Physics Geeks
Essentially the effects of composition and rotation of the Earth on gravity is negligible (on the order of 10e-17).
[edit on 14-9-2007 by Badge01]