Inspired by scuba diving at Puerto Galera

Classical Mechanics Level 3

In the picture above, the balloon (as denoted by a circle) is filled with a green gas which is of the same density as the water. Assume that it is floating just below the surface of the completely still water, and that the rubber of the balloon is weightless with negligible volume. Suppose that is suddenly pushed downward for a brief moment, after which the force acting on it is removed. What would happen to the balloon?

The balloon will stay where it is. The balloon will return to its original position just below the water. The balloon will eventually sink to the bottom of the water. The balloon will move in a harmonic fashion, surfacing and returning to where it was.

Manuel Kahayon by Manuel Kahayon , 21, Philippines

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1 solution

Manuel Kahayon
Nov 8, 2017

As the balloon sinks, pressure increases. As pressure increases, density increases. As the density of the balloon increases, it sinks!

3 Helpful 0 Interesting 0 Brilliant 0 Confused

can u speak spanish?

A Former Brilliant Member - 3 years, 7 months ago

what about density of water that also increases with depth

Aryan Gupta - 2 years, 8 months ago

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