What is the smallest radius of an unbanked (flat) track around which a bicyclist can travel if her speed is 31 km/h and the coefficient of static friction between the tires and the road is 0.29?

Question

Chemistry

Barbara Reid

4 March, 01:36

What is the smallest radius of an unbanked (flat) track around which a bicyclist can travel if her speed is 31 km/h and the coefficient of static friction between the tires and the road is 0.29?

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Raul Bridges · Answer 1

Answer: u = 0.30 v = 29km/h = 8.1 m/s Fc = Ff Fc = (mv^2) / r Ff = u (Fn) Fn = mg Ff = u (mg) (mv^2) / r = u (mg) The mass, m, cancels out, leaving: (v^2) / r = u (g) Plugging in what we know, we get: (8.1^2) / r =.3 (9.8) 65.6 = 2.93r r = 22.4 m So, the circle must have a radius of at least 22.4 meters.