Re: [Phys-l] buoyancy on a submerged pole

[brian whatcott <betwys1@sbcglobal.net>]

On 11/5/2010 11:54 AM, Scott Orshan wrote:
> I'm going for the seal explanation. The surface tension of the
> water plus the increase in air pressure from pressing down on the center
> of the lid keeps the water from getting under the lid and exerting a
> vertical force. Can you try holding the lid down from the edges when
> filling the container?
>
>        Scott
Is there some objection to the seal explanation?

If the inward water pressure at the cap's contact circle is less than the
downward pressure of the cap rim due to the head of water over
the cap which it is supporting
AND
the cap and base are smooth/compliant enough
to remove gaps where water can enter
THEN
the cap remains pressed down, wouldn't you say?   :-)

Brian W