Question

The coefficient of static friction between a rubber tire and a wet road is 0.443.
a) On this surface, what is the maximum safe speed of a car going around a level, unbanked circular track of radius 250 meters?
b) How long would the car take to go once around the track at the maximum safe speed?
Help!!!!!

Answer 1

normal force is ... m g

frictional force is ... .443 m g

the frictional force equals the centripetal force
... .443 m g = m v^2 / r
... v^2 = .443 g r

solve for v

the circumference (for once around) is
... 2 π r

divide the circumference by the velocity to find the time

Answer 2

I agree in the fact that the frictional force is 0.443.

Answer 3

this friction coefficient force is vary interesting. gya