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-----Original Message-----
From: phys-l-bounces@carnot.physics.buffalo.edu [mailto:phys-l-
bounces@carnot.physics.buffalo.edu] On Behalf Of John Clement
Sent: Thursday, October 21, 2010 11:20 AM
To: 'Forum for Physics Educators'
Subject: Re: [Phys-l] Definition of upthrust or buoyancy
I think the wording is just fine. Consider the downward air pressure
on the
top of the piling and the weight of the wood above the point at which
you
are calculating. And don't forget that the vertical stress is not the
same
as the horizontal stress.
Make a free body diagram, just as we expect students to do!
John M. Clement
Houston, TX
Find the average normal stress in a cross section of the piling at
height h/2 above the surface
of the pond.
should read:
Find the average normal stress in a cross section of the piling at
height h/2 above the surface
of the concrete.
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