Question

A race car travels on a flat circular track at the maximum possible speed without slipping. If the radius of the track is 39m and the coefficient of friction is 0.73, how long (seconds) does it take the race car to complete 5 laps?

Answer 1

force friction=centripetal force
mg*mu=mv^2/r
solve for v

then time=distance/velocity=5*2PI*r/v