On a runway of a decommissioned airport, a 2050 kg car travels at a constant speed of 100 km/h. At 100 km/h the air drag on the car is 1000 N. Assume that rolling friction is negligible. (a) What is the force of static friction exerted on the car by the runway surface, and what is the minimum coefficient of static friction necessary for the car to sustain this speed? Fs = N ?s, min = (b) The car continues to travel at 100 km/h, but now along a path with radius of curvature r. For what value of r will the angle between the static friction force vector and the velocity vector equal 45.0?