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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.