To test the performance of its tires, a car

travels along a perfectly flat (no banking) cir-

cular track of radius 516 m. the car increases

its speed at uniform rate of

at ≡

d |v|

dt = 3.89 m/s

2

until the tires start to skid.

if the tires start to skid when the car reaches

a speed of 32.8 m/s, what is the coefficient of

static friction between the tires and the road?