The earth rotates once per day about an axis ping through the north and south poles, an axis that is perpen?

The earth rotates once per day about an axis ping through the north and south poles, an axis that is perpendicular to the plane of the equator.uming the earth is a sphere with a radius of 6.38 x 106 m, determine the centripetal acceleration of a person situated (a) at the equator and (b) at a latitude of 13.0 � north of the equator.