19. Fluid Mechanics

Buoyancy & Buoyant Force

Multiple Choice
A submarine is stranded on the bottom of the ocean. Which of the following statements best explains why the buoyant force acting on the submarine does not cause it to rise to the surface?
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Multiple Choice
Why does a hot air balloon rise in the atmosphere?
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Multiple Choice
If the entire apparatus is completely submerged in water, which of the following statements about the buoyant force acting on it is correct?
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Multiple Choice
A block floats with 40% of its volume above water. When you place it on an unknown liquid, it floats with 30% of its volume above. What is the density of the unknown liquid?
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Multiple Choice
Why will a block of iron float in mercury but sink in water?
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Multiple Choice
Which property do all floating objects have in common when placed in a fluid?
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Multiple Choice
A coin is dropped into a shallow lake. As the coin sinks deeper, the buoyant force acting on the coin:
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Multiple Choice
You want to build a large storage container, with outer walls and an open top, as shown, so that you can load things into it, while it floats on fresh water, without any water getting inside. If the bottom face of the container measures 3.0 m by 8.0 m, how high should the side walls be, such that the combined mass of container and inside load is 100,000 kg?
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Multiple Choice
Suppose a certain type of wood has a density of $650 {kg/m}^{3}$ . If a block of wood $5 . 0 cm$ long, $5 . 0 cm$ wide, and $4 . 0 cm$ high were placed into a pool of water, how high would be the portion of the block above water?
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Multiple Choice
A large rectangular raft with a density of 650 kg/m^3 is floating on a lake. The surface area of the top of the raft is 8.2 m^2 and its volume is 1.80 m^3. Given that the density of the lake water is 1000 kg/m^3, what is the buoyant force acting on the raft?
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