Questions tagged [buoyancy]
Use "buoyancy" for any question where an object is suspended or submerged in a fluid. Buoyant force is the force that acts upward on a partially or completely submerged object.
705 questions
1 vote
0 answers
58 views
Cheerios force, nanotechnology [closed]
So apparently , I had thought that is, can Cheerios effect used for like controlling nanobots & nanoparticles in a fluid environment? I do not have much knowledge on this topic but I am very ...
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19 votes
6 answers
2k views
Special theory of relativity paradox (buoyancy)
We have a submarine (sub) in a frictionless liquid and the average sub density is equal to the density of a liquid. Sub is fully submerged not touching the bottom. Now the sub moves at near speed of ...
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0 votes
2 answers
173 views
Does resistance on a floating object increase, the deeper I push it?
For example, if I have a balloon, and I force it underwater. Is the force required to submerge it to a depth of 1 foot, the same as the force required to push it from 1 foot deep to 2 foot deep, or ...
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0 votes
0 answers
79 views
Has the kinetic energy of falling into the water also been transferred to the water in the pool?
The water falls vertically onto a thin and lightweight iron disc, and then flows horizontally in all directions on the disc. However, the disc does not sink to the bottom of the water. My question is, ...
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1 vote
1 answer
180 views
How precisely does the density of an object need to match the density of water to achieve neutral buoyancy?
The classic explanation I can find online is that something is neutrally buoyant when its density equals that of the fluid it sits in. For something like a boat, it can sink and increase its submerged ...
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1 vote
1 answer
108 views
Can a floating object achieve any arbitrary submerged volume fraction by rotation if fluid density is unrestricted?
I'm studying buoyancy and am curious about how much control one has over a floating object's orientation and the fraction of its volume that lies below a fixed horizontal plane (the "waterline&...
0 votes
1 answer
162 views
Air carrying almost 2 kg of lead per liter of air through water
The other day some divers and I were doing an experiment under water: attaching lead to a plastic bag that (based on print on the bag) can contain 10 liter of something, blowing air into the bag and ...
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1 vote
2 answers
204 views
Addition of a liquid to a U-tube
If there's some liquid $A$ in a U tube, and another liquid $B$ is added to it on one side then it occurs to me that whether the liquid $B$ is more or less dense than $A$, the liquid $A$ level on the ...
- 301
2 votes
2 answers
337 views
Buoyancy as a reactive force in a Newton third law force pair
I was inspired by the question Which way does the scale tip?, so I have conducted a branch of simplified experiment. I have weighted on the scales glass of water without and with stone immersed ...
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2 votes
1 answer
217 views
Fluids conceptual question about the law of continuity and Bernoulli's principle in regards to pressure
I was working on some problems when I stumbled upon some issues in my problem solving and conceptual reasoning. I hope you are going to be able to assist, below I will post my issues which I have only ...
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7 votes
8 answers
1k views
Difference in weights between two submerged objects [duplicate]
Both the basketball and the medicine (steel) ball are the same size, which means they're displacing the same amount of water. That should mean the buoyant force is the same on both, right? But then ...
- 123
5 votes
4 answers
478 views
Thinnest layer of water to produce buoyant force
Consider an object placed in a container with water. We know that if done carefully, a thin layer of water can provide buoyant forces to float heavy objects. However, the thickness of the water layer (...
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0 votes
1 answer
122 views
Does the small bubble stay at the center of the water sphere or float towards the surface of the water sphere?
Assuming the International Space Station has a water sphere with a small bubble at its center, is this bubble stationary or will it float towards the surface of the water sphere? I think that due to ...
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-1 votes
1 answer
105 views
Why does the buoyancy force in a fluid depend only on the density of the fluid in question? [duplicate]
Pressure force underneath an object equals the weight of the fluid if all above the bottom edge of the object was just the fluid but not the fluid and object. $P$ (on object in fluid) $= \rho$ (of ...
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0 votes
3 answers
424 views
Confusion about the Buoyancy force
Here is the part of the textbook that led to confusion: Question: Why do we not regard the weight of the cylinder when calculating the buoyant force? As I learned previously, there is a downward force ...
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