1. What is the centripetal force acting on a 1.5 kg mass moving in a circular path with a centripetal acceleration of 18 m/s2?

2. A race car makes one lap around a race track of radius 50 meters in 9 seconds.

a. What was the circumference of the track?

b. What was the car's magnitude (and direction!) of velocity?

c. What was the car's magnitude (and direction!) of acceleration?

3. An athlete whirls a 7 kg hammer tied to the end of a 1.3 m long chain in a horizontal circle. The hammer makes one revolution in 1 s. What is the centripetal force (and direction!) acting on the hammer?

4. A student swings a 0.5kg rubber ball attached to a string over her head in a horizontal, circular path. The string is 1.5 meters long and in 60 seconds the ball makes 120 complete circles.

a. What is the velocity of the ball?

b. What is the ball's centripetal acceleration?

c. What is the ball's centripetal force?

5. A 100g mass is attached to a string that is 75 cm long. The mass is swung in a horizontal circle that goes around once every 0.80 seconds.

a. What is the centripetal acceleration of the mass?

b. What is the tension in the string?

6. A 0.50 kg mass is attached to a string 1.0 meter long and moves in a horizontal circle at a rate of 0.5 seconds per revolution.

a. Find the centripetal acceleration of the mass.

b. Calculate the tension in the string.

7. It takes a 900 kg car 12.3 seconds to travel at a CV around a circular track of radius 90 meters.

a. What is the centripetal acceleration of the car?

b. How much centripetal force is acting on the car?

c. What provides this centripetal force?