The hydrostatics tag has no wiki summary.
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What is the ration of volume to lift helium? [closed]
I've been searching for a usable direct conversion, but most of what I've found used a lot of rounding. What is the exact formula?
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Hydrostatic pressure on a teapot spout
The phenomenon where water flows on the outside side of a teapot spout is named "The teapot effect", and occurs due to a difference in pressure between water and the atmosphere. Consider the image of ...
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Calculating pressure in accelerated fluids in closed and open vessels?
The question asked was "what should be the acceleration such that the pressure at both the points marked by thick dots be equal? the vessel is open and cubic with side 5m?"
Initially i considered ...
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Pascal's law: pressure of fluid at different locations
I know that's stupid question, but I'm really confused what my teachers says, so I need to check that theory.
Here are just two ordinary connected containers, which are full of water.
On grounds ...
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1answer
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Hydrostatic pressure at lateral directions
I just read that, with respect to a stationary tiny cube, suspended in a fluid, that has a negligible weight and dimensions:
Pressure is the same in every direction in a fluid at a given depth, ...
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1answer
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Measure density with the help of buoyancy
I am trying to derive a formula to calculate the density of a irregulary shaped object.
I can measure the (false) weight of the object in pure air (of known density), and the (false) weight of the ...
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1answer
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Effect of water on wobble of rotating structure
If we have a structure that rotates to create artificial gravity, then if the mass isn't perfectly distributed along the circumference the CM will be offset from the geometric center so there will be ...
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Problem in average height
Let, diameter of cylinder hole of height 30m and diameter 2m filled with water. In a book, when author tried to find out the power for lifting all of the water then he used average height. why is ...
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1answer
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Sideways motion between a vertical launch from a planet and landing [duplicate]
I saw a video some days ago (Hello Kitty in Space) of a schoolgirl successfully launching a balloon into space which later popped and landed ~47 km from launch site.
If I vertically launch an object ...
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Stat mech explanation for separation of one liquid from another in gravity?
If one mixes two distinct ideal gases above the Earth's surface, one with a higher molecular mass than the other, then at equilibrium, their number density gradients will be such that at low heights, ...
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4answers
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How can the surface of a liquid exist if there are no attracting molecules above it?
Okay this is probably a stupid question but here goes:
We know that molecules in a liquid are attracted from all the molecules around it so there is no net attraction. Well, then how do the ...
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At what velocity does sea water leave a pipe run into a fresh water lake (for equal surface levels)?
If I took a fresh water lake* whose surface is exactly as sea level, and connect it to the sea with a pipe filled with sea water, with both ends of the pipe at exactly the same depth from the surface, ...
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How far can water rise above the edge of a glass?
When you fill a glass with water, water forms a concave meniscus with constant contact angle $\theta$ (typically $\theta=20^\circ$ for tap water):
Once you reach the top of the glass, the water-air ...
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Does the magnitude of pressure on the sides (not the top and bottom) of a volume depend on depth?
I understand that at a point in a fluid, such as water, the fluid will be in equilibrium as the sum of the pressure from all directions will equal to zero. For a volume of water, the reasoning should ...
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1answer
113 views
Supermarket refrigerator - why is it noticebable colder in this shop area?
As we know fridge can't cool room in which it is (according to Second Law of Thermodynamics, heat emitted by fridge is greater than heat absorped).
However, when we go next to the fridge in ...
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1answer
222 views
Pascal law with two connected cylinders filled with water, and 50kg stones at both their ends
If I have two connected cylinders filled with water, and 50kg stones at both their ends (pressing both ends of the water) how much weight do I need to add on one side so that one of the stones reach ...
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Need help understanding dynamic and static contact angles
I've run into a conceptual road block. I'm coming to you guys because I think my adviser is getting annoyed with me. The concept involves a meniscus being pulled up a cylinder. I understand that ...
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1answer
153 views
Basic Concepts of Water Pressure for Plumbers
I am learning how to install water pipes and I was told that to check if a pipe is leaking water I need to check the water pressure. But I don't understanding how water pressure works inside the ...
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Liquids, atmospheric pressure [closed]
A. If a digital camera is rated as "water resistant up to 3m" how much pressure can the camera take before it starts to leak?
B. If the back of the camera has an area of 0.02 m squared how much force ...
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1answer
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In hydrostatics, is it possible for the bouancy to be greater than the weight of a body?
In the diagram we have two bodies, with density and volume $\delta$ and $V$, and a fluid $\ell$.
$$\delta_1=0,7 \rm\frac{gr}{cm^3}$$
$$\delta_2=2 \rm\frac{gr}{cm^3}$$
$$V_1=100 \rm {cm^3}$$
$$V_2=10 ...
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Hydrostatic forces
I've started learning hydro static force system right now.
I have problem understanding one thing.
In the picture I'm looking for the forces on the black lines:
A part is making the purple force above ...
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1answer
195 views
Why do sea levels not rise uniformly around the world?
While reading the article Hawaii’s Beaches Are in Retreat, and Its Way of Life May Follow on The New York Times's website, I was surprised to find out that sea levels do not rise around the world at a ...
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1answer
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Is this formula for the energy of a configuration of 3 fluids physically reasonable?
I have studied for a couple of months now a mathematical model of the energy of a configuration of immiscible fluids situated in a fixed container such that the fluids fill the container. In other ...
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1answer
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Surface tension of N non-mixing fluids
I am a mathematician, not a physicist, so please be gentle with me if I write something wrong.
Consider a bounded, regular container $\Omega$, which is filled with the fluids $F_1,...,F_N$ which do ...
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why is it hard to push the empty upside down mug inside the water
It is hard to push the empty upside down mug inside the water as it has air present inside its cavity which prevents the water from entering inside the mug.But when we tilt that mug which is still ...
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At the molecular level, how is the pressure at the bottom of a lake higher than at the top?
Surely the temperature of the molecules is the same throughout the water. Using $p = \rho g h$ seems to assume a constant density as well. But then how is it that the force per unit area on an object ...
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1answer
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Proof of the Hydrostatic weighing equation?
I've been trying to derive this equation for about two hours:
But I can't seem to get it. In my class, we are using it to accurately measure the volume of irregulary-shaped objects, but I ...
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Is mid-water bouyancy a classic example of a balanced but unstable system?
I came to this thought experiment as I was pondering good teaching examples of stable and unstable systems. It occurred to me that stable systems are really quite abundant. For a shoot-from-the-hip ...
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Can pockets of air exist underwater?
If yes, why don't they fill up with water, and can you breathe the air there? Like, it's not exactly atmosphere there, but an underwater cave with higher ceiling.
P.S. Possible that it has a ...
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616 views
Why is a hot air balloon “stiff”?
1) Why is a hot air balloon stiff?
2) Is the pressure inside the balloon higher than the pressure outside (atmospheric pressure)?
3) If the pressure inside is higher than the outside, how is it ...
