Multiple choice

A glass ball is weighed by a brass weight. Which of the following will happen, if the system is kept in vacuum?

  1. The beam scale will remain horizontal.

  2. Pan of glass ball will rise.

  3. Pan of glass ball will decrease.

  4. Depends on the amount of air extracted.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Glass has lower density than brass, so in air it experiences greater buoyant force. In vacuum, buoyancy disappears, reducing the upward force on the glass side more than the brass side, making the glass pan go down (decrease).

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