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speed reaches 2.78 m/s. Determine the magnitude of the tension in each of the two vertical support chains. 12. A sport utility vehicle, of mass 2.1 X 103 kg, travels in the horizontal plane around an unbanked curve of radius 275 m at a speed of 26 m/s, without sliding. (a) Determine the minimum coefficient of static friction between the tires and the road. (b) How would your answer in (a) be affected if the mass of the vehicle were greater because of the presence of heavy cargo? (c) How would your answer in (a) be affected if the curve were sharper (i.e., if its radius were smaller)? Circular Motion 159