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Mar12-12, 06:41 AM
P: 365
2. In the second case, the water can't remain there without some side pressure. What contains the water on from the sides? When you assume water ( without flowing) there, You are assuming a side pressure too.
Gaskets remain water. Torque from gaskets ? So small if the film is 1Ám or less I think we can consider like 0.

3. Seems you had no problem with the circular thread at the beginning. But after you cut it by the cuboid, You found a contradiction. When we remove, we should consider the forces due to the removed parts.
Yes, I'm finding the solution of the problem;