Questions tagged [fluid-statics]

Fluid statics or hydrostatics is the branch of fluid mechanics which deals with the study of fluids at rest and the pressure exerted by it on an immersed object. If your question is about the study of fluids in motion, use the tag "fluid-dynamics" instead.

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24 views

Why the dust on the wing cannot be cleaned by air flow?

I recently saw that the dust on the airplane's wings are frequently cleaned by some human workers (generally after every trip, workers clean the fine dust on wing's surface by hands). But I have a ...
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Body submerged in two liquids

A container has 2 immiscible liquid of different densities. Suppose water on botton and kerosene oil on top. A body floats at the boundary of both such that it is partly in water and partly in the oil....
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Why is surface tension measured in units of milliNewtons per meter? Rather than square meter(s)?

Why is liquid surface tension written in units of mN/m, or milliNewtons per meter? The related concept of surface energy for solids uses units of milliJoules per square meter.
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What is relation between weight and height in hydraulic lift? [closed]

I am trying to lift a 10kg weight using 1kg weight as shown in diagram. block A is 1kg and block B is 10kg will the lighter block be able to lift the heavier block. Also what will bw the height by ...
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If you exhale and sink, then crouch underwater, why will you bounce?

I don't understand the step under the red arrow. I'm assuming that the blue line isn't the ocean floor, for we're assuming "deep waters". I happened upon this picture on Reddit. After you "exhale and ...
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How do tee splits affect water pressure in pipes? [closed]

I have a couple questions about how water pressure is affected by pipe tees. I am trying to determine where to place pressure limiters and what PSI limit to use for an irrigation system. Question 1) ...
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Find contact angles using Neumann's triangle [closed]

have an equilibrium triple junction where force balance exists between three forces $\gamma_1=0.05$, $\gamma_2=0.01$ and $\gamma_3=0.15$. Now I need to find the angle between each of them using ...
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1answer
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Fluid dynamics for the sepiolite

I would like to know some about the physics of an interesting material, the sepiolite. I mean the material from the Wikipedia article Sepiolite where are explained the general and identification ...
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1answer
17 views

Force by a thin soap film

Why the force exerted by a thin soap film is on a movable wire of length L is $2TL$ where $T$ is the surface Tension of the liquid? Why is there a factor of $2$? I can't understand it because there ...
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2answers
35 views

Pascal's Law, When does pressure equal out?

I've been looking into how hydraulic lifts work and i don't quite understand yet how Pressure and Forces relate. Let's assume the water is on equal level on both sides and i apply a force to The ...
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0answers
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Horizontal Pressure on a Curved Wall [closed]

Can someone please clarify why the horizontal pressure on the wall is 0.5 x $\gamma$ x $h^2$? Is this because F = P x dA, and P pressure is $\rho$ x g x h. Integrating P x dA gives you 1/2 x $\gamma$...
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When air is pushed into a soap bubble, where does the work go? [closed]

In this problem: Air is pushed into a soap bubble of radius $r$ to double its radius if surface tension is $T$ then whats the work done in the process? I can find out the answer $(24\pi r^2 T)$ by ...
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1answer
28 views

A word for the tipping level of a bottle

Is there a word for the level at which a bottle needs to be filled such that if even a drop of additional liquid were in that bottle and that bottle were placed on its side on a perfectly horizontal ...
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1answer
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Why does the liquid column in a capillary tube exert pressure as its weight is already balanced by surface tension?

I read that the meniscus, due to surface tension, exerts an upward pull to the liquid column below it. The water rises to a height until the weight balances the pull. Now liquid exerts pressure ...
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1answer
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Characteristics of Pressure - Fluid Mechanics

What does it mean when without flow, the pressure must be transmitted normal to solid boundaries and arbitrary surfaces in a fluid? Also, the pressure at a point is the same regardless of orientation ...
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Pascal's law and the variation of hydrostatic pressure

In the case of the hydraulic lift (pictured) according to the pascals law we say that the pressure on $A_1$ is the same as $A_2$. In here do we assume that the $d_1$ value involved is so small that ...
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1answer
49 views

How exactly does thermodynamic pressure relate to mechanical pressure?

I would have liked to get some details on the relation between the mechanical and thermodynamical definitions of pressure. I have read that $p_\mathrm{mech}=p_\mathrm{therm}-\operatorname{div}\left(\...
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2answers
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Why is a pump's head usable for any fluid?

As far as I investigated, a pump has a specific head in a determined flow rate (relating to its power and rotating speed). Then considering the formula ($\Delta P=\rho g H$), $\Delta P$ is adjusted ...
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1answer
90 views

Math behind helium balloons lifting objects to (almost) space

So I've seen those big helium balloons that are not even filled all the way up, but they still manage to reach heights of up to 30 km. I think they're mainly used for research and etc. Furthermore, I ...
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0answers
26 views

Would a solid object submerged in a super fluid conserve its momemtum as it travels?

Reading about Helium at low temperatures has me scratching my head in confusion. Liquid Helium-4 at around 2K exhibits properties of a super fluid. Viscosity of a super fluid is equal to zero, which ...
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0answers
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How to keep a air bubble bottom of a water glass?

Suppose we have a glass of water. if we make a air bubble bottom of the glass using a straw that will quickly come to the surface because of the pressure ,density difference and the gravity . Assume ...
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0answers
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How would one calculate the forces experienced when a pressurized container is breached?

So in the situation, i'm wanting to find the force of the fluids inside the container rapidly exiting the container through a rupture or hole. I'm attempting to figure out how to calculate this but ...
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1answer
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Question About Buoyant Force and Weight of an Object

Looking at the relationship between buoyant force and the weight of an object, I found this explanation, which makes sense "If the buoyant force is greater than the object's weight, the object ...
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2answers
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Why is the buoyant force on an object the net force instead of just the force pushing the object up?

Why is the buoyant force on an object the net force (force pushing object up - force pushing object down) instead of just the force pushing the object up? Isn't the force pushing the object up what is ...
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1answer
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Hydrostatic pressure in different Tank shapes [duplicate]

Consider the above drawn tanks (Tank 1 left Tank 2 Right) What Would the hydrostatic pressure from the water at the points where the arrows are drawn. In Case 1 for example Tank 1) Hydrostatic ...
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Is there a fluid not following the communicating vessel effect?

Some substances (I tested a mixture of cement and water, but I believe it works also with spackling paste for example),can behave as a fluid in the preparation container. That is, they form a flat ...
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1answer
28 views

Pressure in a liquid [duplicate]

Say i have a bucket of water. I can understand that at any point inside the bucket there will be a force hence a pressure acting downwards, but why is there a pressure acting side ways as well at the ...
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3answers
74 views

Measurement of Surface Tension of a Liquid by Capillary Rise Method [closed]

The surface tension at the point of contact for water is inwards (as written in my book) so that would mean it vertical component is downwards but why is that vertical component considered upwards? I ...
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1answer
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How can we utilise the excess pressure in a bubble?

In general,the excess pressure in a bubble varies inversely with its radius. In limit of a small bubble the excessive pressure inside the bubble is very high. My question is that how can we utilise ...
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1answer
42 views

Using negative pressure flow to generate electricity from a large body of water

While preparing to drain an "above ground" pool with a regular garden hose, I was thinking about how the hose actually generated a "suction" force. Place one end at the bottom of the pool, connect the ...
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1answer
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How does one prove that specific gravity is the fraction of the object sunk in water?

This is mentioned at 1:01 in this video of khan academy https://www.khanacademy.org/science/physics/fluids/density-and-pressure/v/specific-gravity But I can not find an answer to how this became to ...
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Does multiple outlets (at same level on tank) from an overhead tank increase pressure?

I have a tank that is about 1foot high from my shower, however the pressure(or volume) isn't sufficient. Is it possible to increase the pressure(or volume) at the showerhead by doing the following: ...
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Finding the density of a liquid using archimedes principle [closed]

I'm practicing some physics problems and came across one that's essentially this. An an object of mass $m_o$ has apparent mass $m_o'$ when submerged in a particular liquid. Derive a formula to ...
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3answers
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Why is Pascal's law true?

Pascal's principle state that if an external pressure is applied to a confined fluid, the pressure at every point within the fluid increases by that amount. Is there a mathematical derivation or ...
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2answers
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How does a floating object affect the hydrostatic pressure in the fluid?

I'm reviewing fluid mechanics. I had a question - how does adding a floating mass to a fluid affect the pressure? I understand that the mass will displace the fluid, causing an increase in height. ...
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2answers
61 views

Why does solid pressure depend on area while liquid pressure doesnt [closed]

I don't understand why solid pressure depends on.surface area while liquid pressure doesn't , liquid have weight and if a container is v shaped then all the weight above is acting on small base area ...
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1answer
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When does the stream function vanish?

I don't really get the physical meaning of the constant value that the stream function can take on. I mean, I know when $\psi = \text{const}$ that means that along that path the velocities are tangent ...
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0answers
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Function describing Cross-Section of Fluid Flow

Suppose an infinitely large container has a hole of Area $A_0$ at its bottom (underside). The fluid has a velocity of 0 in the vertical direction at the beginning so $v_0=0$. If the fluid in container ...
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1answer
42 views

Why atmospheric pressure on a liquid and not on a solid? [closed]

An open cylindrical container (radius = 0.5 m) has 100 kg of water. a) Find the water pressure at the bottom of the container. b) Find the pressure exerted by the container on the floor (ignore the ...
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1answer
48 views

Pressure at the foot of ocean waves?

If I'm surfing a 100 ft wave and temporarily dip my finger into the water near my surfboard ..would it experience the pressure due to the whole water column or is there some other principle of ...
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2answers
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Does Pascal's Law hold true in this scenario?

In the attached image, it has been told that the pressure at point A is equal to the pressure at point B(both at the same height). My question: Can this be justified using Pascal's Law? Whether yes ...
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1answer
68 views

Deriving buoyant force from first principles [duplicate]

How can buoyant force be derived from most basic laws of fluids ? I can think of easy one. Consider such scheme of body floating deep in water : Where $dA$ is elementary downward directed surface ...
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2answers
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Why hydrostatic paradox is a paradox?

Someone could have simply told the student that pressure in a container is independent of the shape of container or area of cross section. Why give it the name “Hydrostatic Paradox”? What is the ...
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1answer
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What are 'hydrophilic' spheres?

So, I know that a hydrophilic material is defined as those with a special affinity for water, opposite to hydrophobic, those that naturally repel water. I am investigating the impact of spheres with ...
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1answer
20 views

What is the effect of dust particles on air pressure?

Is there any change of atmospheric air pressure if dust particles are present (which really does)?
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Why is tire pressure lower when parking and higher while driving (and not rise more when driving faster)?

I just noticed this whenever I park the car for a while, the tire pressure goes to a lower value on all tires, and whenever I start driving, it goes higher. The difference is not so big, but it is ...
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1answer
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Why dont we consider the cohesive forces between the surface and inner molecules while formulating excess pressure inside a droplet?

As the surface of a liquid will have imbalanced cohesive forces leading to the phenomenon of surface tension,we just consider the forces among the surface molecules which act tangentially and dont ...
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1answer
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Given 2 hot air balloons, one ten times bigger then the other, which one will float for longer, by how much and why? [closed]

We assume that the balloons are perfect spheres. The temperature inside both is $120^\circ \; C$. Ambient temperature is $20^\circ \; C $ and ambient pressure equals the atmospheric pressure. I don't ...
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1answer
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How does even water rise along a glass plate?

So, I was studying about general properties of matter and topics like surface tension. I came across the phenomenon of water rising along a glass plate like in the picture. I looked for some ...
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3answers
109 views

Why is pressure on object in fluid dependent on height of water column above it whereas the *force* on object is not?

According to Archimedes principle, the buoyant force is equal to weight of the fluid displaced. Buoyant force = Weight of water displaced ...

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