I can't solve this problem for the life of me, and I don't know how to begin even. If someone could explain the procedure, I'd be more than grateful... it can't be THAT hard, I just have no idea where to start. =[ Thanks. "What is the smallest radius of an unbanked (flat) track around which a bicyclist can travel if her speed is 24 km/h and the coefficient of static friction between tires and track is 0.30?" Once again, thanks in advance.