essentials of physics

As the earth rotates through one revolution, a person standingon the equator traces out a circular path whose radius is equal tothe radius of the earth (6.38×10^6m). What is the average speed ofthis person in (a) meters per second and (b) miles per hour?I know the number of seconds in a revolution of the earth is84600.What is confusing me is the radius of the earth andwhat number to use in the calculationfor meters.


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