Suppose: I fill a tube that is open at the top with water and I make a liquid-tight opening in the bottom through which an endless rubber cord passes, which I lead up again outside the tube via a pulley, where it goes down again via a pulley . The part that is in the column experiences an upward force and therefore wants to go up. The part next to the water column only experiences gravity. Will the rubber cord turn?
Answer
I’m sorry Wim, the cord won’t turn. The piece of cord protruding into the liquid has a vertical interface with the water. So the pressure of the water is [gemiddeld] horizontal. The resultant of the water pressure is zero, and has no component in the vertical direction; there is no “buoyancy force”. (it would be if you cut the cord at the bottom of the tube, and sew the tube at the bottom.)
Answered by
Engineer Bart Dierickx
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