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- 1. Multiple-choice5 minutes1 pt
A pickle sits 8.0 cm from the center of a circular, rotating platter. The platter rotates such that the pickle’s tangential speed is 4.8 cm/s. What is the pickle’s centripetal acceleration?
2.9 cm/s2
1.3 cm/s2
5.8 cm/s2
0.6 cm/s2
- 2. Multiple-choice5 minutes1 pt
A tether ball tied to a pole by a rope swings in a circular path with a centripetal acceleration of 2.7 m/s2 . If the ball has a tangential speed of 2.0 m/s, what is the diameter of the circular path in which it travels?
10 m.
1.5 m
3.0 m
4.5 m
- 3. Multiple-choice5 minutes1 pt
An inline skater skates on a circular track 120.0 m in diameter at a tangential speed of 9.20 m/s. If the skater’s mass is 68.5 kg, what is the magnitude of the centripetal force on the skater?
65.1 N
96.6 N
10.5 N
48.3 N
- 4. Multiple-choice3 minutes1 pt
An object moves in a circle at a constant speed. Which of the following is not true of the object?
Its centripetal acceleration points toward the center of the circle.
Its tangential speed is constant.
Its velocity is constant.
A centripetal force acts on the object.
- 5. Multiple-choice2 minutes1 pt
A car travels in a circle with constant speed. The net force on the car ___.
is zero because the car is not accelerating
is directed forward, in the direction of travel.
is directed toward the center of the curve.
none of the above
- 6. Multiple-choice5 minutes1 pt
Jessica is making a chocolate milkshake in a blender. A tiny, 0.0050 kg chocolate chip is rapidly spun around the inside of the container with a speed of 14 m/s, held by a centripetal force of 10 N. What is the radius of the blender at this location?
0.098 m
0.13 m
0.007m
0.014 m
- 7. Multiple-choice5 minutes1 pt
A toy airplane at the end of a string 0.80 m long moves in a circle on a table. The airplane has a mass of 1.7 kg and the string has a breaking tension of 37 N. Calculate the maximum speed the cart can attain without breaking the string.
17 m/s
4.2 m/s
7.5 m/s
3.7 m
