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The earth rotates once per day about an axis passing through the north and south poles, an axis that is perpendicular to the plane of the equator. Assuming the earth is a sphere with a radius of 6.38 X 10^6 meters, determine the speed and centripetal acceleration of a person situated (a) at the equator, and (b) at a latitude of 30.0 degrees north of the equator.

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