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Questions and Answers
What allows a submarine to float on the surface of the water under normal conditions?
What allows a submarine to float on the surface of the water under normal conditions?
- The average density of the submarine is less than that of sea water (correct)
- The ballast tanks are filled with water
- The weight of the submarine is equal to the weight of the water displaced
- The submarine is completely submerged
What happens to a submarine's average density when it needs to dive into the water?
What happens to a submarine's average density when it needs to dive into the water?
- It remains unchanged
- It becomes less than sea water's density
- It becomes greater than the density of sea water (correct)
- It becomes equal to the density of sea water
What is the role of compressed air in a submarine's buoyancy regulation?
What is the role of compressed air in a submarine's buoyancy regulation?
- It is used to equalize pressure with the surrounding water
- It forces water out of the ballast tanks to help the submarine rise (correct)
- It maintains the submarine's structural integrity
- It fills the ballast tanks to help the submarine sink
When a submarine is submerged, what condition must be met for it to rise back to the surface?
When a submarine is submerged, what condition must be met for it to rise back to the surface?
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What occurs when the submarine opens the underbelly doors of the ballast tanks?
What occurs when the submarine opens the underbelly doors of the ballast tanks?
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Study Notes
Submarine Floatation
- Submarines are fish-shaped ships that can travel underwater
- Submarines contain ballast tanks filled with compressed air
- The submarine normally floats on the water surface like a ship
- The submarine's average density is less than that of water
- Ballast tank underbelly doors are closed while floating on the surface
- To dive, the ballast tank underbelly doors open
- Water rushes into the ballast tanks
- The submarine's average density becomes greater than the density of water
- The submarine sinks
- To rise, compressed air from steel cylinders is directed into ballast tanks
- Compressed air pushes water out of the ballast tanks
- The submarine's average density becomes less than that of water
- The submarine rises to the surface
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