First slide

Fluid statics

Question

A cork ball is floating on the surface of water in a beaker. The beaker is covered with a bell jar and the air is evacuated. What will happen to the ball?

Easy

A

Sink a little
B

Rise a little
C

Remain unchanged
D

Sink completely

Solution

Here, upthurst due to air will be replaced by water vapours. As water vapours are lighter than air, hence upthurst decreases. So the ball sinks a little.

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