Concept explainers
Shortest possible day. Consider the fact that an object sitting at the equator is undergoing uniform circular motion due to the rotation of the earth. (a) Draw a free-body diagram for a box of mass m that is placed at the equator. (b) Now suppose that we allow the day to become shorter than 24 h. Use Newton’s second law to calculate the maximum speed, due to the earth’s rotation, that the box can have and still remain on the surface. (c) How long would this day be in hours?
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