[Phys-L] Re: fluid

[Brian Whatcott <betwys1@SBCGLOBAL.NET>]

At 01:03 PM 1/19/2006, you wrote:
> I'm starting to teach fluids this afternoon, for the first time in
> decades, and I just stumped myself. Putting your finger at the top
> of a straw immersed in a glass of water allows you to lift the
> straw. I understand that the difference in pressure between the
> water near the top of the straw and that at its bottom causes the
> water to rise, but what forces lift the straw?
> skip


Though I replicated Skip's observation, with a tall glass of cool water
and a short plastic drinking straw, I concluded that the force that
  kept the straw attached to my finger tip was merely its small net
  buoyancy while completely submerged and vertical.



Brian Whatcott    Altus OK    Eureka!
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