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



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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