To test a new set of tires on a sports car, a driver runs the car in a level par

Question

To test a new set of tires on a sports car, a driver runs the car in a level parking lot, following a marked circle of fixed radius 100m. The driver increases his speed very slowly and gradually, so that at any point the tangential acceleration makes a negligible contribution to the car's total acceleration a. The driver finds that the car skids when his speed just exceeds 33.2 m/s.

What is the coefficient of static friction between the tires and the parking lot surface (paved like a road). The accerlation due to gravity is 10 m/s^2

1. 1.1
2. 0.8

3. 0.48

4. 0.1

5. 0.95

6. 0.5

7. 0.25

8. zero

9. 0.75

Explanation / Answer

m*v^2/r = mue*m*g

mue = v^2/(g*r)

= 33.2^2/(10*100)

= 1.1

so option 1 is the corfrect answer

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