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JAMB Physics 2007 Question 48

Question 48

Motion

A gramophone record takes 5s to reach its constant angular velocity of 4π rads−1 from rest. Find its constant angular acceleration.

  1. A.20.0π rads−2.
  2. B.1.3π rads−2.
  3. C.0.8π rads−2.
  4. D.0.4π rads−2.
Show the answer and explanation

Answer: C (0.8π rads−2.)

Explanation

Angular acceleration = change in angular velocity ÷ time = 4π ÷ 5 = 0.8π rad s−2.