Re: Buoyancy on a submerged block on bottom of tank

From: PD (pdraper_at_yahoo.com)
Date: 02/06/05 

Date: 6 Feb 2005 12:46:58 -0800

Franz Heymann wrote:
> "PD" <pdraper@yahoo.com> wrote in message
> news:1107698830.133628.182640@z14g2000cwz.googlegroups.com...
> >
> > Edward Green wrote:
> > > CWatters wrote:
> > > > "Jeffrey" <jhopkins4"no spam"@sc.rr.com> wrote in message
> > > > news:1PjNd.66535$fE4.11298072@twister.southeast.rr.com...
> > > > >
> > > > > How is the Buoyancy on a block determined for the ideal case
> of a
> > > uniform
> > > > > block submerged in a deep, flat bottom tank of water, where
> > there's
> > > no
> > > > water
> > > > > below the block only around it and atop it - the block is
> placed
> > > flush
> > > > with
> > > > > the bottom of the tank?
> > > >
> > > > You need to define "flush with the bottom of the tank" very
> > > carefully.
> > >
> > > Bingo.
> >
> > The operative question being, "Can water get under the block at
> all?"
>
> It will, unless the surfaces are all water-repellent, or the block is
> cemented or cold-welded to the bottom of the tank.
>
> Franz

Not necessarily. Could just be a block with a pliant bottom. Think of a
suction cup.

PD

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