Brain Teaser


A system of two symmetrical, identical, water-filled jars is fixed on a turntable. Each jar has a cork—attached to the bottom by a thread—floating vertically.

What will happen to the corks when the turntable starts rotating?

Details and Assumptions:

  • The jars are closed so that no water spills out.


The water is denser than the corks. As the turntable spins, the water will be pushed outwards with more force than the corks, thus displacing the corks towards the center.

  • Problem by Rohit Gupta
  • Solution by Rohit Gupta
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