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JAMB Physics 1999 Question 8

Question 8

Motion

A particle of mass 10−2 kg is fixed to the tip of a fan blade which rotates with angular velocity of 100 rad s−1. If the radius of the blade is 0.2 m, the centripetal force is

  1. A.2 N
  2. B.20 N
  3. C.200 N
  4. D.400 N
Show the answer and explanation

Answer: B (20 N)

Explanation

F = mω2r = 10−2 × 1002 × 0.2 = 20 N.