Centripetal Force

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7.3Centripetal Force

Centripetal Force Revision Questions

1) A small sphere is moving laterally at 0.4 m/s inside a cylindrical glass as shown in the figure below. What is the maximum diameter the glass must have in order to keep the sphere rotating through the lateral face without touching the lower base of glass? Take g ≈ 10 m/s2.

Physics Tutorials: This image provides visual information for the physics tutorial Centripetal Force
  1. 1.6 cm
  2. 3.2 cm
  3. 6 cm
  4. 60 cm

Correct Answer: B

2) What is the minimum velocity a vertical roller coaster must have so that a 40 kg child not exerting any pushing force on the seat when she is at the highest position during rotation? The radius of curvature of the roller coaster is 80 m.

  1. 2 m/s
  2. 8.9 m/s
  3. 28.3 m/s
  4. 80 m/s

Correct Answer: C

3) The rotor of an engine increases its angular velocity from 2 rad/s to 5 rad/s in 0.1 s. What is the total acceleration of peripheral points of the rotor at the end of this process if its diameter is equal to 20 cm?

Physics Tutorials: This image provides visual information for the physics tutorial Centripetal Force
  1. 3.9 m/s2
  2. 0.39 m/s2
  3. 3 m/s2
  4. 2.5 m/s2

Correct Answer: A

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