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Chuck Britton wrote:
My hypothesis (which I am QUITE ready to have disproved -
experimentally) is that SuperGlue or threads will exert the SAME
upward force on the bottom sheet of glass.
It seems to me that you are hypothesizing a situation where the BOX is subject to only the following three forces
1. A gravitational force (DOWNWARD)
2. A net force due to the fluid that presses on the sides and the top of the box (DOWNWARD)
3. A force due to the glue that attaches the box to the aquarium bottom and excludes water from underneath the box (DOWNWARD)
yet somehow manages NOT to accelerate downward.
Have I misunderstood the hypothesis? Are you imagining some other force that is acting on the box? If so, what is it?