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The key disagreement is this. If I hold a block of wood underwater
and let it go, it will rise. The reason is that the upward force on
the bottom, d*g*A*H, exceeds the two downward forces, namely
d*g*A*(H-L) on the top and the weight W. But if I glue that block to
a piece of steel, there is no longer water under it. There is now
solid glue under it. Hence we no longer have the upward force on the
bottom due to water pressure because there ain't no water below it.
So others argue and that doesn't sound completely unreasonable.
But if I glue that block to
a piece of steel, there is no longer water under it.