3. If the coefficient of static friction for the tires on a road of 0.25, at what maximum speed can a car travel around a horizontal circular road of radius 48 m?

2. A ball is swung by a rope in a vertical circle of radius R. The tension in the rope at the bottom is 3 mg. (a) What is the speed of the ball at this instant? (b) If the rope is cut at the instant it is at the bottom of the circle, which is the distance h above the ground, what horizontal distance D will it travel before hitting the ground?

11. A crate of eggs is located in the middle of the flatbed W of a pickup truck as the truck negotiates a curve in the flat road. The curve may be regarded as an arc of a circle of radius 35.0 m. If the coefficient of static fric- tion between crate and truck is 0.600, how fast can the truck be moving without the crate sliding?

Question 8 A car is travelling into an unbanked turn with radius of 11.0 m. The coefficient friction is 1.4. What is the maximum speed the car can travel and still be able to maintain a circular path? Answer in m/s to one decimal place. Your Answer: Answer Question 9 A ball on the end of a string is swung in a vertical circle. The length of the string is 0.4 m. What is the minimum speed required to maintain the circular motion? Answer in m/s to one decimal place. Your Answer: Answer units

10. A 260-g ball is tied to a string and it is being swung faster and faster in a nearly horizontal circle. When the speed reaches 16.5 m/s the tension reaches a value of 60.0 N, the string breaks. What is the radius of the circle? cm

3. A coin is placed 12.0 cm from the axis of a rotating turntable of variable speed. When the speed of the turntable is slowly increased, the coin remains fixed on the turn table until a rate of 35.0 rpm is reached, at which point the coin slides off. (a) Find the speed of the coin just before it starts to slide. (b) What is the coin's acceleration just before it starts to slide? (magnitude and direction) (c) What is the source of the force that causes the coin to accelerate? (d) Find the coefficient of static friction between the coin and the turntable.

A car rounds an unbanked curve of radius 65 m. If the coefficient of static friction between the road and car is 0.72, then answer the following questions. (a) What force provides the centripetal force? A. Weight of the car B. Normal force on the car from the road C. Force of static friction (b) What is the maximum speed at which the car can traverse the curve without slipping? Enter to 2 significant figures Vmax= 18.07 m/s

12. On a wet road, the coefficient of static friction between a car's tires and the flat road is 0.34. What is the maximum speed a car can safely navigate a turn with a 70.0 m radius of curvature? m/s £60 5 ssf60 f60 ssf

Determine the linear acceleration of a car that is traveling at 22 m/s around an 85 m radius curve.