A curve in a speed track has a radius of 1, 140 ft and a rated speed of 125 mi/h. (Rated speed is speed at which no friction is needed to keep car on road - see hint). Knowing that a racing car starts skidding on the curve when traveling at a speed of 155 mi/h, determine the coefficient of static friction between the tires and the track under the prevailing conditions. (hint, you will need to find the banking angle in order to find the friction coefficient). Answer: 0.2097