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

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

Not really bitten -that was the point - we had determined that the cup would not rise and that pressure sealed the O-ring in an earlier discussion a couple of weeks ago. I revived the example to show the presence of glue was not relevant.

Bob at PC

________________________________________
From: phys-l-bounces@carnot.physics.buffalo.edu [phys-l-bounces@carnot.physics.buffalo.edu] On Behalf Of brian whatcott [betwys1@sbcglobal.net]
Sent: Thursday, November 04, 2010 8:06 AM
To: phys-l@carnot.physics.buffalo.edu
Subject: Re: [Phys-l] buoyancy on a submerged pole

Hehe....with a head of water over the cup, it is pressed into the 0-ring.

Consider yourself bit by an interesting pretend experiment gotcha - one
that is not that impractical, even!

Brian W

On 11/3/2010 9:13 PM, LaMontagne, Bob wrote:
> Take a cup and glue an o-ring to the lip of the cup. Lay a thin playing card on the o_ring. Tip the cup upside down and lower the cup and card into the aquarium until the card touches the aquarium bottom. Slide the card out. What will the cup do? No glue here.
>
> Bob at PC
>
> ________________________________________
> From: phys-l-bounces@carnot.physics.buffalo.edu [phys-l-bounces@carnot.physics.buffalo.edu] On Behalf Of Chuck Britton [cvbritton@embarqmail.com]
> Sent: Wednesday, November 03, 2010 9:06 PM
> To: Forum for Physics Educators
> Subject: Re: [Phys-l] buoyancy on a submerged pole
>
> At 5:48 PM -0700 11/3/10, John Mallinckrodt wrote:
> > I don't understand this.  There is no upward force being exerted on
> > the bottom of the aquarium by the box.  How could there be?  What
> > mechanism do you envision by which the box could possibly exert such
> > a force?
> The glue.
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