Circles and Revolutions

Consider a 22.3g basketball whirled in a horizontal circle by a 1m long string. If the basketball completes 28 revolutions in 1 minute, how fast is the ball moving (in m/s)?(g to kg - x10^-3) - min to s x 60

• 1.46 m/s

• 2.9 m/s

• 8.98 m/s

• 175.9 m/s

Consider a 22.3g basketball whirled in a horizontal circle by a 1m long string. If the basketball completes 28 revolutions in 1 minute, what is the net force on the basketball (in N)?

• 0.19 N

• 1.92 N

• 19.16 N

• 191.6 N

A 40 g stone is whirled horizontally on the end of 0.60 m string at a speed of 2.2 m/s

What is the average velocity of the stone during one revolution

• 4 m/s

• 6.2 m/s

• 7 m/s

• zero m/s

A 100 kg racecar moves around a flat circular truck of radius 50 m with a constant speed. The car makes one revolution around the track every 10 seconds. Find the magnitude acceleration of the car

• 1974 m/s^2

• 19.73 m/s^2

• 25 m/s^2

• 50 m/s^2

A ball moves with a constant speed of 4 m/s around a circle of radius 0.25 m. What is the frequency of the motion?

• 1/2 s

• 0.4 s

• 2.5 s

• 2.5 s^-1

A racecar is traveling at constant speed around a circular track. What happens to the centripetal acceleration of the car if the speed is doubled?

• It remains the same

• It increases by a factor of 2

• It increases by a factor of 4

• It is decreased by a factor of one-half

• It is increased by a factor of one-half

Suppose that you are whirling a rock on a string in order to make the rock go half as fast, how much centripetal force must be supplied?

• One fourth as much

• Half as much

• The same centripetal force would do

• Four times as much

• Three times as much