A bucket of water is swung in a vertical circle of radius 0.4 m. The minimum speed at the top so the water stays in is (g = 9.8 m/s^2):

  1. 1.98 m/s
  2. 0.99 m/s
  3. 3.96 m/s
  4. 2.8 m/s
Answer

A) 1.98 m/s

At the minimum speed, weight alone provides the centripetal force: mg = mv^2r Rightarrow v = gr = 1.98 m/s. SLO P-11-B-15 · Application

Physics MCQ · More Circular and Rotational Motion MCQs · Practise