Multiple choice

A bottle of soda water is grasped by the neck and swung briskly in a vertical circle. The bubbles collect

  1. near the bottom of the bottle

  2. in the middle of the bottle

  3. near the neck of the bottle

  4. uniformly all over the bottle
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

When the bottle is swung, the liquid is pushed outward by centrifugal force. The air bubbles, being less dense than the liquid, are displaced toward the region of lower pressure, which is the center of rotation (the neck).

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