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A metal cube rests on the bottom of an empty vessel. Water is then poured in until the cube is completely submerged. The downward force on the part of the vessel bottom that is in contact with the cube will
- will increase
- will decrease
- will remain the same
- will become zero
Correct answer: will increase
Solution
With the cube sealed against the bottom, water pressure acts on the top (downward) but not underneath, so there is no buoyancy to lift it. The extra downward pressure on the top increases the force on the bottom under the cube.
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