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> On 11/3/2010 9:33 AM, Chuck Britton wrote:
> (an off-list exchange - posted without permission - hope it's ok)> > (Still scratching my head vigorously)
>
> At 10:14 AM -0400 11/3/10, bennett bennett wrote:
>> The way I see it, the force of fluid pressure on solid is normal to
>> the surface at all points, so the anchored pole, (with no water
>> pushing on the bottom surface), is not lifted by the water on its
>> side, unless the water is viscous and moving upward.
>>
>> If there is a notch, the pressure on the non-vertical surfaces of
>> the notch will stretch only the thin part of the pole, but the up
>> and down forces will be equal, since the vertical components of the
>> forces on the surfaces of the notch are equal.
>>
> And the way _*I*_ see it is that the top of the (totally) submerged
> pole doesn't give a flying-flip what's going on at the bottom of the
> pole.
> The top of the pole 'wants' to float, and it WILL if given a chance.
>
> How does the complicated contact force at the bottom change what's
> going on with the rest of the object??
>
By preventing the water from contacting the bottom surface.
--
Clarence Bennett
Oakland University
Dept. of Physics, (retired)
111 Hannah
Rochester MI 48309
248 370 3418
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