A 76 kg person stands on a normal force scale at the equator. Research to determine the average radius of the earth. 6.37 x 108 b. Calculate the period of the person's circular motion due to the rotation of the earth (in s). a. C. d. e. f. Calculate the frequency of the person's circular motion. What force causes the circular motion (what is the source of the centripetal force) Calculate the velocity of the person at the equator due to the rotation of the earth. Calculate the centripetal acceleration of the person at the equator. Does the centripetal acceleration represent a change in speed for the person? Explain. h. Calculate the value of the normal force acting on the person.