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Why can some objects become partially submerged?
Objects with specific gravity between 0 and 1 become partially submerged in the respective fluid. Why don't they either just sink of float completely above water?
What mechanism of force or energy demands that hydrostatic pressure remains constant (at any given depth).
1 Answer
- Andrew SmithLv 78 months agoFavorite Answer
I have answered several of these for you. Including why the pressure at any given depth is the same acting in all directions due to the molecular motion. So for this. Simplify it. Consider a cuboid where the lower surface is in the water. The force of the water on the lower face pushes upwards and is Pressure * Area. The force pushing downwards is mg.
Now if the two forces add to anything other than zero the object will accelerate. Either up or down.
As the pressure increases with depth and reduces as the depth reduces then the object will either rise until the upwards force equals the downward force. Or it will sink until the two are equal. Or it will sink until the water covers the top face. In which case the downward force increases so the object sinks and keeps sinking. ( Titanic did this experiment on a large scale )
