All Questions
Tagged with water fluid-statics
116
questions
-1
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2
answers
103
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Why rain drops are spherical while water droplets on a glass surface are flat?
Why are raindrops spherical when falling through the air, but lose their spherical shape when they are on a flat surface?
3
votes
1
answer
94
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Does having a liquid (less dense than ice) above a floating (in water) ice cube, change the fact that the water level remains constant when ice melts?
An ice cube floats in water, with a liquid (less dense than ice) above it. When the ice cube melts will the water level go up, down or remain constant?
- 135
0
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0
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35
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Shape of a static capillary surface
I am studying the effects of surface tension and in particular the shape of a capillary interface in hydrostatic condition.
Let's recall the Young-Laplace Equation
$ \Delta P = \sigma \bigg(\frac{1}{...
- 1
1
vote
1
answer
57
views
Why does the water not flow on this tub [closed]
I found this problem on Brilliant and it's quite interesting because you have 2 tubes that are connected and on both ends they are put under a different pressure:
On the upper hole there is less ...
- 69
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
1
answer
111
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Why if I raise my hand over the water while being underwater, my whole body goes down?
Another weird question, I know, and may sound simple but I'm now trying to see why a lot of the things that we usually do without thinking, have some sense in physics, like this one.
Let's say you are ...
- 45
1
vote
2
answers
233
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What is that makes us slow down in water? [closed]
I know this may sound very weird, but I'm curious on what makes the water be like water? Like why, when we get into a pool, we are like in a "lower gravity" pull? All our movements are ...
- 45
0
votes
1
answer
72
views
Increase water pressure (e.g. for watering the garden) using the principle of a hydraulic press
Does anyone know a device that incorporates this principle? Process is as follows:
You get a lot of water at low to mid pressure (let's say 1 bar)
A device D converts the work that 1 liter of water ...
- 1,785
1
vote
0
answers
108
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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
0
votes
2
answers
497
views
What will happen to balloon if it is filled with water and kept inside container containing water? Consider balloon at middle of container [closed]
Consider water-filled balloon kept initially at mid-height of container. Will it lift or sink or stay there? Will balloon shrink or stay as it is? (Assume balloon material is elastic. Pressure above ...
5
votes
2
answers
562
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What is the name of the physics concept where water runs back under the edge of the roofing? Is it just surface tension?
I work as an apprentice roofer and I'm interested in the why of things. Nobody I have asked can confidently answer this question so here I am.
This diagram shows the phenomenon:
The image is from ...
1
vote
1
answer
159
views
Pressure at the bottom of a swimming pool [closed]
Why is atmospheric pressure it not taken into account when finding the force exerted by incompressible fluids onto a surface within the fluid? If you don't understand my question, then consider the ...
- 49
-2
votes
2
answers
101
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Water maintains an equal level in connected vessels
Water maintains an equal level in connected vessels.
What is this property called?
- 11
1
vote
0
answers
69
views
Water tower hydro generator? [closed]
$500$ gallons, $100$ feet high, at tank $10$ inch pipe, every $4$ feet a reduction of $2$ inch pipe diameter, ending in $1/4$ inch tubing to jet nozzles, each nozzle would spin an independent ...
- 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 ...
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