Chapter 05, Problem 15 Multiple-Concept Example 7 and Concept Simulation 5.2 review the concepts that play a role in this problem. Car A uses tires for which the coefficient of static friction is 0.335 on a particular unbanked curve. The maximum speed at which the car can negotiate this curve is 26.8 m/s. Car B uses tires for which the coefficient of static friction is 0.683 on the same curve. What is the maximum speed at which car B can negotiate the curve?

The question relates to motion on a circular path.

Let the radius of the circular path be R.

The centripetal force for circular motion is provided by frictional force

frictional force is equal to μmg, where μ is coefficient of friction and mg is weight

Equating cenrtipetal force and frictionl force in the case of car A

mv² / R = μmg

R = v² / μg

= 26.8 x 26.8 /.335 x 9.8

= 218.77 m

In case of moton of car B

mv² / R = μmg

v² = μRg

=.683 x 218.77x 9.8

= 1464.35

v = 38.26 m / s.