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Old Feb 5th 2019, 08:16 AM   #1
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Join Date: Feb 2019
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Would this tubes move upwards ?

Hey, I have a question, I simply draw it on paint.

- There is a main tube full of water.
- There are two tubes full of air in the main tube.
- Air tubes are tied to each other with a stick.
- There are holes at the bottom and top of main tube at the same size with tubes that tubes can move through it and there is no water leak at these point while air tubes are moving up and down.


Would air tubes move upside with the buoyancy of water if it was located as in the drawing below ?


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Old Feb 6th 2019, 03:20 AM   #2
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Posts: 484
That's an interesting question ...

The upper air tube has buoyancy force acting on it proportional to the depth of immersion .

The lower air tube is pushed down with a force proportional to the height of fluid above it .

So the force pushing the lower tube down will always be greater than the force pushing the upper tube up ...

The two air tubes would move downwards.
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