The earth has a radius of 6,400 km and turns around once on its axis in 24 h.


 

(a) What is the radial acceleration arad of an object at the earth’s equator? Give your answer in m/s2 and as a fraction of g.



 (b) If arad at the equator is greater than g, objects will fly off the earth’s surface and into space. What would the period of the earth’s rotation have to be for this to occur? 


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