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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Pressure in a fluid at rest

I hope this is the right place to post such a question. I'm studying Continuum Mechanics from Gurtin's book, and so far in my class we've seen Cauchy's the about the existence of stress, and nothing ...
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Why work done to submerge a ball is $pV$?

In this stack post Mr.mark says the work done to submerge a ball is $pV$. I don't seem to comprehend this . I believe this would be answered in a comment but and answer could help me show my ...
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Change in temperature of overflowing container

Mixing of identical fluids at different temperatures is simple, as per here: https://physics.stackexchange.com/a/24433/290018 We have a slightly different situation in that the container is ...
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Physically interpreting Archimedes Law

I understand that Archimedes law is "the buoyant force is equal to the weight of the fluid displaced". It is often derived from $F=\rho Vg$, where $\rho = m/V$ and the formula is rearranged. ...
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Pressure in an accelerated container

Let us take a closed container completely filled with some liquid.Let us assume that the container moves with some acceleration in the horizontal direction. Usually when we have such situations,we ...
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Work done in submerging a weightless sphere, I am getting exactly half the correct, can someone point out my mistake! [closed]

This is the question: A sphere of radius 0.4 m and having negligible weight is floating in a large freshwater lake. How much work is required to completely submerge the sphere? The density of the ...
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In nature, (generally) when liquid molecules lies on a solid surface which model does it came close with?

In nature, (generally) when liquid molecules lies on a solid surface which model does it came close with? {Does water molecules lies on solid interface with air pocket or without air pocket?} Cassie-...
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Should this object float?

I was learning buoyancy on Khan Academy and it was going well until I thought of this thought experiment. Consider if you had a tube of water with a hockey puck that completely touches the sides (but ...
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Water level in a sinking boat is constant?

I came across this question in a physics worksheet: "A small hole is punched into the bottom of a rectangular boat, allowing water to enter the boat. As the boat sinks into the water, which of ...
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Got confused about weight loss in liquid [closed]

Suppose two objects of the same mass but of different densities are dropped on water. The large object (say polypropylene) has a lower density than water and the small one (say stainless steel) has a ...
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Height Of Mercury In A Mercury Barometer In An Accelerating Frame

I am currently in high school and I came across a physics problem that asked to find whether the height of the mercury in a mercury barometer would change when it is kept in an elevator that ...
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Ball float valve in an overfilled tank [closed]

A ball float valve (YT) is used to stop inflow into a tank. A Ball floats up when the water level reaches close to the pipe, forcing the valve to close. Consider a tank with an inlet (inlet A) with ...
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What is the direction of the force of buoyancy at the bottom of the liquid? [duplicate]

I know that the force of Buoyancy always acts upwards, still I had a doubt Let's assume (everything is ideal), we have a block which is submerged in a liquid which has less density than the block, Now ...
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What is the meaning of absolute pressure in this fluid mechanics question?

Why does 6.8 m of water take absolute pressure height not gauge (pressure at point C)? what is the logic? If anyone assumes that local atmospheric pressure 755 mm of mercury is the pressure of the ...
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More details on surface tension and contact angle

I am a high school student and I am very confused in surface tension , In some books it is written that contact angle is formed because the surface of a liquid can't hold tangential stress so the ...
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Why does a layer of peas rise when I boil water?

I put water and boiled them in a pot. Then I poured in frozen peas. What happened is some of the peas when to the bottom of the pot, and on the top there formed a layer of some of the peas (Between ...
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Fluid Mechanics/Fluid Dynamics help - Conservation of Mass (Mass Flow Rate)

I need to figure out how exactly mass flow rate relates to volume, height and pressure difference with respect to time. I have a gas can that is pouring out water at a mass flow rate of 3 gal/min. As ...
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The tank in the figure is accelerating upwards($+y$ direction) at a rate of $2.94 \ \text{m/$s^2$}$ [closed]

"The tank in the figure is accelerating upwards($+y$ direction) at a rate of $2.94 \ \text{m/$s^2$}$. The pressure $P_1$ above the liquid in the tank is $1.41 \ \text{psig}$. The tube end is open ...
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Does a mercury barometer measure absolute pressure or gauge pressure?

I know that gauge pressure takes the atmospheric pressure as a zero point whereas absolute pressure measures the pressure in the open air or something along those lines. Does a barometer measure ...
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1answer
52 views

Is pressure frame-dependent?

Suppose Ryan presses the liquid in flask with piston inside a accelerating lift with acceleration $t$. He presses it with force $F$ on area $A$ assume mass of fluid be $M$. So from lift frame forces ...
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Help with at home experiment for physics degree: how to suck water up a tube

I'm doing an at home experiment for my physics degree due to covid restrictions, and I need to suck water up a vertical tube. I would really appreciate any equipment recommendations or other advice ...
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Height variation with water inside a tube

I have quite a basic question in hydrostatics that's bugging me and would be happy to get some help. Suppose I have a tube inside a water tank (the tube's opening is inside the water) and say the ...
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Why is the vertical component of the hydrostatic force on curved surface equal to the weight of the imaginary volume of liquid enclosed?

Why is the vertical component of the hydrostatic force on curved surface equal to the weight of the imaginary volume of liquid enclosed? I tried to understand it by concept of equilibrium but a bit of ...
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Pressure increases with increase in depth

Confusion in law of liquid pressure. Pressure increases with increase in depth from its free surface. So, does it mean that $h_0$ increases or $h$ increases (height of the body). Not sure which ...
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1answer
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Is this correct for pressure exerted by a liquid? [closed]

$P_0$ is atmospheric pressure and $P_1$ is height×density×gravity. So , is the diagram correct for saying that Total pressure in the liquid = $P_0+P_1$. Since the direction of $P_0$ vector is ...
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Beaker and suspended ball weight measured by spring balance

Can someone explain to me why when we suspended a ball with a density greater than that of water in water by the help of a string why is the weight measured by the spring balance=Weight of beaker + ...
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How the bubble size in a champagne bottle evolve?

How the bubble size in a champagne bottle evolve ? Is it fixed or is evolving with time ?
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How does surface tension prevent a pin from sinking?

Please explain simply how surface tension in water which as far as I understand is a force pulling the water molecules at the surface towards each other horizontally so how does that prevent a ...
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1answer
21 views

How might one design an infinity balloon without an appropriate material

A while ago, I was working on a idea I had. I wanted to design a hypothetical sail that was effectively weightless. Why I wanted a 'weightless' sail is a rabbit hole that I'm not going to get into but ...
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How do I know pressure is equal in a static fluid in connected tubes?

This is from knight. What I don't get is why $p_1=p_2$. I don't think we can use the hydro static pressure formula because the top and bottom of a cone are not identical. I get why pressure at the top ...
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What affects Buoyant force?

Why isn't buoyancy affected by the object immersed in water? I know that more depth means more pressure means more buoyancy. But based on Newton 3rd law, the water should apply a force back on the ...
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At which point does the pressure of the water act on a dam?

I'm currently working on a problem. I have a dam with height h, and width w. As part of the problem I need the torque resulting from pressing against the dam. I calculated the amount of force applied ...
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Surface tension and capillary rise intution

I am high school student I am very confused in "surface tension", My confusion is that: 1) In this image I have shown that, In some books the reason for this shape of meniscus is explained ...
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What will the excess pressure of a water drop on a table be?

I'm aware of the formula for excess pressure of a spherical drop given by :$$\frac{2S}{R}$$ Where $R$ is the radius of the drop. But what if the drop was on the floor? Using the formula for excess ...
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What is apparent density?

For any floating body apparent weight and apparent density of body is zero.how.explain also explain what does apparent density meean.
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2 connected tubes filled with water, placing a stopper in one and raising the other, how can I determine pressure exerted onto the stopper?

If I have two 20ml test tubes connected at the base via a thinner flexible U-shape tube and I pour a set amount of water (40ml) into one test tube whilst both are at level height, the water ...
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Submarine buoyancy

Maybe a silly question but.. A submarine has ballast tanks to control it's buoyancy. To submerge, water is allowed to fill the ballast tanks which displaces the air inside. When a submarine is ...
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How do these icicles seem to defy gravity and form in my ice cube tray in my freezer? [duplicate]

I've been seeing this effect in this particular freezer since we purchased it a couple of years ago and I finally want to know the answer. In the picture below you can see that certain ice cubes will ...
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3answers
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What density of an object of more than one substance affects the buoyant force?

If we immerse a sealed cup of a liquid in a fluid, what density is taken in consideration when it comes to the buoyant force, the density of the cup itself (the substance in contact with the fluid) or ...
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Hydrostatic pressure on a plane surface fluid dynamics

If the container is filled with the fluid and we want to measure the on one of its vertical wall. As we know the pressure increases with depth. Pressure on each point on the vertical wall will be ...
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How many stable equilibrium points are there for a generic floating body?

Given a convex solid with uniform density and no symmetry (not a ball, not a cube, not a cylinder, not a rugby ball...), which is less than the density of water, if it's thrown into water, it will ...
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Force on curved surface of submerged cylinder

A cylindrical wooden log of length L and radius r is floating on water(density d) completely submerge find the force on lower curved surface of the cylinder I tried integrating the lower surface by ...
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Intuitive explanation of Archimedes' principle? [duplicate]

https://en.wikipedia.org/wiki/Archimedes%27_principle The wikipedia entry for Archimedes' principle (buoyant force = weight of fluid displaced) has interesting formulas explaining why it's true, but ...
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Theoretical justification of buoyancy in two or more liquid layer

If an object is dissolved in a container of two liquid layers so that volume $V_1$ is in liquid 1 and volume $V_2$ is in liquid 2. $ρ_1>ρ_2$ be given where it refers to respective densities. I ...
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4answers
65 views

Does the water level rise?

if I have A closed vessel that is half-filled with water. There is a hole near the top of the vessel and air is pumped out from this hole. will the level of water rise apparently, the level of water ...
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Expected value of tensor products and matrices?

I had a problem where I considered two particles in a flow field, connected to each other by a spring. The vector connecting the particles is: $$\tag{1} \boldsymbol{s}=\boldsymbol{r}_{2}-\boldsymbol{r}...
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How does the kinetic-molecular theory explain why atmospheric pressure is greater at lower altitudes than at higher altitudes?

It is believed that pressure exerted by a gas is caused by "momentum exchanges by colliding molecules". Also it is a fact that the atmospheric pressure on a body is greater at lower ...
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Why did water not drip form this small bottle?

I will explain what I have done and my observations. I took this bottle and added water into it. 1st time , 25 percent , then 75 percent and then 100 percent of water was filled in the bottle. Yes , ...
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4answers
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Fully drain water tank when it gets full with no external power [closed]

This is something I want for my home, not a scholar exercise. I have a tank that fills slowly because it is there to capture drops from a leak. This tank is on top of my house. I want this tank to ...
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2answers
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Tip of the Iceberg [closed]

Is it possible to approximate the volume of an entire iceberg if one happens to know the volume of the visible tip? (Assume the water is perfectly still.) If so, how may that be done?

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