All Questions
57
questions
10
votes
2
answers
487
views
Could a fish swim out of a sphere of water in a zero-gravity environment?
Can a fish swim out of a sphere of water in a zero-gravity environment?
I am going to state some assumptions.
We assume the sphere of water is not affected by any thermal properties of its zero-...
- 343
0
votes
1
answer
83
views
Why are there 2 ways of predicting if an object will float or not?
I thought about it for a second, I have always thought that for an object to float it had to be less dense than water, and if it had more density then it would sink. But then if it sinks or floats ...
- 45
1
vote
0
answers
108
views
Is there a depth under which the buoyant force is no longer sufficient to bring a diver back to the surface? [duplicate]
I came across the story of diver Yuri Lipski who died while diving in the Blue Hole.
This made me wonder something and it may be a stupid question but I thought I'd ask:
For a human diver with normal ...
- 11
2
votes
6
answers
572
views
Confused about how the formula for buoyancy is derived
The formula for fluid pressure of any point at depth $h$ in a fluid is $p = hρg$. Here, the formula is derived by calculating the mass of the fluid column above the point (which is equal to $Ahρ$, and ...
- 59
1
vote
0
answers
32
views
How the weight of an object lighter than water changes if it is pushed and tied to bottom, going upwards and floating on the surface? [closed]
Imagine I push an object to the bottom of water with a rope (through a ring at the bottom) and attach the rope to the top of container. If I cut the rope the object will go upwards.
will there be ...
- 21
2
votes
1
answer
711
views
Time it takes for an object to sink?
I am trying to determine how long it takes for an object to hit the bottom of the water. I've been looking at Stoke's Law, but can't quite figure out how to get to my answer.
Obviously, there are a ...
- 21
0
votes
1
answer
59
views
DISPLACEMENT OF WATER [duplicate]
Floating objects displace their weight?
what does this statement actually mean?
Does this mean that floating objects displace the amount of water that's equal to their weight and so buoyancy is equal ...
- 29
2
votes
1
answer
458
views
Displacement of water - Archimedes' principle
Floating objects displace their weight and objects that are completely submerged in water displace their volume. So, my question is that does a floating object displace less water than an immersed ...
- 29
0
votes
2
answers
184
views
Why isnt a taller object more buoyant?
If an objects buoyancy is dependant on the difference in pressure between its two faces, why arent taller objects more buoyant since the pressure difference is larger?
1
vote
1
answer
158
views
Could you siphon water from a column of water that is supported by buoyancy?
A cylinder with a radius of $10 \;\mathrm{m}$ and a height of $10 \;\mathrm{m}$ is resting on top of a body of water. The cylinder is less dense than water. At the center of the base (equal to water ...
user259268
-1
votes
2
answers
86
views
Can a body, made of semi-light material, theoretically float on water (ocean) if it has enough airtight space under it? What are the risks? [closed]
Hello scientists and amateurs,
Basically, if I put a quite big airtight container on water and use it as a type of float to wander around ocean (Let's say pretty big, size of a half a football field). ...
- 1
1
vote
3
answers
2k
views
A balloon under the ocean
So everybody is familiar with how buoyancy works in theory. However, if I sink a balloon filled with air underwater, the pressure of the water will compress the air inside it, reducing the volume of ...
13
votes
4
answers
6k
views
Why do we feel weightlessness in water but not on land?
When we draw a Newtonian free body diagram of a man standing still on land, we draw force g and the reaction force. In water when floating still, we still have force g but we also have the reaction ...
- 354
-1
votes
2
answers
72
views
Water and pressure
We know that as we go down the water volume, we see rise in pressure. It's because of gravity. Right?
But then if that's true why would the particle down the surface will apply the upthrust or buoyant ...
0
votes
1
answer
68
views
Floating garbage collector [closed]
I am trying to build a floating garbage collector. The concept isn't that hard, but when it comes to the math and physics it's beyond me. The idea is a floating bin that allows the garbage to fall ...
- 1