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

["John Clement" <clement@hal-pc.org>]

I think a closeup of the lid would be very helpful.  The oh so light air
should have compressed and lid deformed or bowed downward.  This would be
more confirmation of compressive interaction between the lid and the
aquarium.  To see the compression an object like a soda straw across the lid
could be used as a reference.

Nice experiment, but as I already said it is just a suction cup.

John M. Clement
Houston, TX


> On 11/5/2010 10:55 AM, Robert Cohen wrote:
> > For what it is worth, I placed a large shallow screw-on top (like the
> > lid to a can of baby formula but deeper) on the bottom of a larger
> > container.  I then filled the container with water, holding down the lid
> > while it filled.  I then let go.
> >
> > No adhesives were used.
> >
> > You can predict what happened and then look at the pictures:
> > <http://www.esu.edu/physics/cohen/phys-l/>
> >
> > ----------------------------------------------------------
> > Robert A. Cohen, Department of Physics, East Stroudsburg University
> > 570.422.3428   rcohen@po-box.esu.edu    http://www.esu.edu/~bbq
>
> As well to mention explicitly, that this cap was  full of oh-so-light air,
> yet it stayed stubbornly at the base of the water container
>   in which it was immersed.
>
> Nice pix!