Quiz #3.2 (A)

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

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

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

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.

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

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

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