How large must the coefficient of static friction be between the tires and the road if a car is to round a level curve of radius 95-m at a speed of 80 km/h.

Answer 1

For the car not to skid while in the curve, the centrifugal force must be less than the fricitonal resistance.
mv²/r <= μmg

or

μ > v²/gr

Remember to convert v from km h-1 to m s-1

80 km/hr=80*1000m/3600s=