Re: [Phys-L] Nice question on buoyance and balance

["LaMontagne, Bob" <RLAMONT@providence.edu>]

Yes

> -----Original Message-----
> From: Phys-l [mailto:phys-l-bounces@phys-l.org] On Behalf Of Jeffrey
> Schnick
> Sent: Wednesday, January 29, 2014 9:01 AM
> To: Phys-L@Phys-L.org
> Subject: Re: [Phys-L] Nice question on buoyance and balance
>
> That's interesting.  Are you saying that if all one did was to fasten the table
> tennis ball, with a string, to the bottom of the beaker on the left and do
> nothing to the beaker on the right (e.g. do not stick a steel ball in it) that the
> system would remain in equilibrium?
>
> > -----Original Message-----
> > From: Phys-l [mailto:phys-l-bounces@phys-l.org] On Behalf Of
> > LaMontagne, Bob
> > Sent: Wednesday, January 29, 2014 8:55 AM
> > To: Phys-L@Phys-L.org
> > Subject: Re: [Phys-L] Nice question on buoyance and balance
> >
> > The answer was almost instantly obvious from forces - The string on
> > the ping pong ball pulls up on the beaker, negating the buoyancy. The
> > left beaker has all internal forces - which must cancel.
> >
> > Bob at PC
> >
> > > -----Original Message-----
> > > From: Phys-l [mailto:phys-l-bounces@phys-l.org] On Behalf Of John
> > > Denker
> > > Sent: Wednesday, January 29, 2014 7:33 AM
> > > To: Phys-L@Phys-L.org
> > > Subject: Re: [Phys-L] Nice question on buoyance and balance
> > >
> > > On 01/29/2014 02:36 AM, Savinainen Antti wrote:
> > > > a former studen of mine send me a link to a nice question:
> > > > <http://wealthmanagement.com/question/puzzler-odd-balance>.
> > > >
> > > > I usually ask a variation of this question in my class. It is, in
> > > > my opinion, a good example of conceptual reasoning which goes well
> > > > beyond rote memorization. Probably many of you have seen this
> > > > question before but I thought it might be worth sharing.
> > >
> > > I put that in the category of problems that are very much easier to
> > > solve in terms of momentum flow, as opposed to force balance.
> > >  ++ I was able to solve it at a glance, in a fraction of a
> > >   second, using the momentum-flow approach.
> > >  -- I had to think about it for a while to figure out a
> > >   solution based on force-balance.
> > >
> > > The connection between force and momentum-flow is spelled out here:
> > >   http://www.av8n.com/physics/force-intro.htm
> > >
> > > ===
> > >
> > > Note that a goodly number of the FCI questions are in the same category.
> > > They go from "Huh?" to "Duh!" when translated to momentum-flow
> > > language.
> > >
> > > More importantly, a tremendous number of real-world tasks are in the
> > > same category.  For example, fluid dynamics is formulated in terms
> > > of the momentum transfer from one parcel to another.  I reckon it is
> > > "possible" to formulate it in terms of the force acting at the
> > > boundary between one parcel and another, but that would be sheer
> > masochism.
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