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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Would water flow in the following system?

Would water flow in the following system?
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Hydrostatic pressure in varying cross-section reservoir

Consider an axisymmetric reservoir whose axis of symmetry is $z$. Let its cross section $A(z)$ become progressively thinner as $z$ increases. That is, $A(z) \xrightarrow{}0$ as $z \xrightarrow{}\infty$...
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On the defining properties of hydrostatic center of pressure

I'm having some issues understanding the defining properties of the center of pressure (Sadly, I have an awful teacher which follows a believe-me-its-true strategy and uses a book which I find too ...
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Why forces exerted by fluids, inside or outside, are always perpendicular?

I was learning about pressure due to fluids when I encountered the lines such as 'liquid layers exert perpendicular force on each other, fluid exert force on a body perpendicular to it in all ...
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Pressure in a half empty U bend

All of the water in my game will be gravity fed. My current problem I'm trying to solve is if I have a U-Bends like this: ...
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Summation of fluid pressure and pressure as a physical quantity

I recently started the chapter fluid statics and was reading through a book and also watching some videos. I read the fact that fluid pressure is ISOTROPIC at a point i.e same from all direction which ...
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How do you build a self-submersible boat? [closed]

So I've been thinking for a long time now about making a self-submersible boat out of a plastic bottle without electronics. It should resurface by itself after a few minutes. I was thinking that it ...
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Determining the height of fluids in a U-shaped tube? [closed]

A narrow U-shaped glass tube with open ends is filled with 25.0 cm of oil (of specific gravity 0.800) and 25.0 cm of water on opposite sides, with a barrier separating the liquids. How would one find ...
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What is the pressure for A and B here?

If there is a piston pushing down on the bigger branch, what do the pressures of B and A become? There are 3 scenarios I can think of and I'm not sure which one applies. With Pascal's law, the ...
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Motion of object in liquid [closed]

a cylinder radius $r$ height $h$ mass $m$, density 'd' fitted with massless compression spring at bottom and dropped into water tank height 'H' ,what is the bounce up height of the cylinder after ...
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Hydrostatic Pressure at Base of Floating Object in Liquid with Greater Density

Let's say there's an object floating in liquid. The depth of the object below the surface is $d$ and its height above the water is $h$. The density of the ball is $p_b$ and the density of the liquid ...
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If air (or fluids in general but especially air) didn't move, would it still exert pressure? [closed]

If gas particles in air were stationary. As usual, they had very weak intermolecular spaces and forces but they didn't move, would they still exert pressure on objects around them?
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Is hydrostatic pressure gradient due to density gradient?

Assuming an incompressible fluid, as is often done, the hydrostatic pressure law is derived: $p = p_0 + \rho g h$. I have a qualitative question: is it correct to say that as depth increases, the ...
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Membrane Deflection

Please forgive me if this problem has been addressed elsewhere. In order to winterize my swimming pool, I cover it with plastic and weight the perimeter. In the spring, it’s necessary to pump off the ...
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Will bottom pressure decrease?

This is a problem I have struggling with. I’ve been discussing it with friends. Consider a boat in a swimming pool with a heavy rock on it. If we throw the rock into the pool, it'll sink. Through some ...
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Hydrostatic pressure trapped inside a bottle

I think I almost understand what is going on here, I just need a discussion The question is: Why is hydrostatic pressure trapped inside bottle? I have an open bottle and then I put a cap on it. The ...
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What happens to water as it is increasingly compressed?

Imagine we put some volume of water in an infinitely strong container, and then start to slowly exert a force on the top of the water , with increasing pressure. What happens to the water over time? ...
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Pressure Difference with respect to Surface Tension

Suppose we have a drop on a flat surface of radius $R$ and volume $V$. Then by a standard force balance argument we can relate the surface tension ($\sigma$) and the pressure difference ($\Delta P$) ...
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Are collisions ignored while calculating fluid pressure?

Consider a container of height $h$ filled completely with fluid of density $\rho$, Assume pressure at top is zero therefore pressure at the bottommost points will be $p_b=\rho gh$ and therefore force ...
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Buoyant force and finding the weight of water required to float object [closed]

Find the weight of water required to float the pontoon in the casting dock below when the gap all around is $0.1 \text{ m}$. The total weight the pontoon is $500 \text{ t}$ ($1 \text{ t} = 8896 \text{ ...
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Looking for fluid mechanics exercise problems

I just started studying fluid mechanics with by Faber and the book doesn't seem to contain any exercise problems. Can anyone recommend me a good source for fluid mechanics exercise problems so I can ...
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The Lagrangian could not capture the critical system like that of the Newtonian?

Consider a wooden brick, when being set in the middle of the water, both the Lagrangian and the Newtonian could provide the same result. Consider a wooden brick being pushed to the bottom of the water,...
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Is the velocity in parallel pipes the same as a single pipe according to Bernoulli's equation?

This system pushes water through a nozzle. I can use Modified Bernoulli's equation to calculate the nozzle velocity as such: $$V_3 = \sqrt{2g\left(\frac{P_1}{\rho g}+ z_1-\Delta h_L\right)}$$ where ($\...
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Why does weight increase if an object is held in water?

If you put a glass of water on a scale and partially submerge an object in it while still holding the object in hand, the scale readout shows an increase in mass. It happens if the density of the ...
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Specialising Archimedes' principle

I have a problem with Archimedes' principle. Suppose 'A' is a object with a density of 'd'. So A will immerse in a liquid that has a lower density than d. But when it touches a single molecule of that ...
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Why hydrostatic pressure only depends on height from the surface to object? [duplicate]

Why hydrostatic pressure depends on the height from the surface to the object? I know that the formula-- $pgh$ shows that it depends on the height; what is the reason?
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Is capillary pressure significant?

I have a hydraulic system pressure to be measured in cm of water. It is done by tapping a graded tube, and simply measuring the height of the water column (usually at around 10-20 cm of water). If I ...
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Do solar panels help keep roofs on during tornadoes or hurricanes? (does it help at all for pressure equalization on the roof?

further to this previous asked question Why are roofs blown away by wind? do solar panels mounted to roofs "help" at all by keeping roofs in place during wind storms? i.e. if the pressure ...
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How can I get the mathematical model of the surface of a liquid rotating on a inclined surface?

So I was playing around with my lab equipment, and I saw that if I let water rotate like this: It seems that the motion of the surface is periodic.How can I calculate an equation for the motion of ...
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Physics behind inverted manometers

Can someone help me understand the physics behind inverted U-Tube manometers? I’m familiar with typical manometers, and I know the approach to solve for static fluids in typical manometers. I stumbled ...
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A body is floating in a liquid of equal density and then pushed down. Why does it sink?

A body is just floating on the surface of a liquid. The density of the body is the same as that of the liquid. The body is slightly pushed down. What will happen to the body? (A) It will slowly come ...
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Whats the fault in the logic I am thinking for not balancing of a needle and any blade etc. on water?

As we know that contact angle of water with any surface is approximately zero, so why a blade or a needle floats on water as such surface tension can only provide force parallel to the water surface ...
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Does the free surface of a liquid in a rotating frame depend on the viscosity?

If we consider an incompressible, isothermal, stationary Newtonian flow (density ρ =const, viscosity μ =const), is it true that the form of the parabolic free surface in a rotating frame (constant ...
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Does the thickness of the soap film gets increase if we stretch it more and in case of pricking it?

When there is a rectangle film whose three adjacents sides are being fixed by wire , the last one is being able to move freely by a movable bar , if we consider the film to be having a thickness h , ...
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I can’t understand how the level of water in a cup with ice cube floating would stay the same when it dissolves? [closed]

it’s my first time taking physics, so I’m a no expert, I need your help. I’m facing problems understanding the question below, which states that the answer is “c” and the water level should stay the ...
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Pressure Difference in Hydrostatic Systems

In hydrodynamic systems, a pressure difference will cause a force. Does that apply in hydrostatic systems? If two points inside a (static) fluid have a difference in height of dh, will there be a ...
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Does water exert normal force?

If water donot exert normal force than why? As I know normal force is due to repulsion force of electrons so why not?
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Finding specific gravity of a plank [closed]

A wooden plank is floating on water in a pool. It is tethered to the bottom of the pool by a string attached at mid-point of an edge of its bottom face, which causes it to float with a diagonal of one ...
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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?
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All conditions for a siphon to work?

I am struggling a bit with the concept of siphon. Firstly, if we consider a pipe filled with water, the inlet is in a tank of water at the altitude $z_I$, and the outlet is in the air at $z_O$. Here ...
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Why should Apparent weight of the object floating in a fluid is 0?

The buoyant force act on the object and weight of the body act on water, so do they both cancel out? Now one more thing weight experienced by a body is equal to reaction force acting on a body so here ...
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Pressure with depth formula derivation

Consider a unit volume element of fluid consisting two horizontal circular areas S1 and s2, connected by vertical lines as boundries. (sorry,I can't upload an image) Now for derivation of pressure ...
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Barometer with two liquids of different densities

Okay, so I understand the basic working principle of a Hg barometer: Take a container with Hg, then take a tube filled with Hg and invert it inside the Hg in the container. The Hg in the tube drops ...
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What is the speed of an air bubble in the glass?

This question arises from reading the sf poem Aniara, where the trip of the spaceship is compared to the movement of an air bubble encapsulated in a bulk of glass. How fast can such a bubble travel?
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Surface tension caused by the Solid-Air interface and its direction

Contact angle of liquid in a tube-Wikipedia I'm a beginner studying microfluidic. I'm so confused about the direction of the surface tension. Like in the figure above, the direction of $f_{la}$ and $...
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Confusion about Hydrostatic Equilibrium

When deriving the hydrostatic equilibrium for a static fluid, it is said that the net force on a fluid element dV of the fluid must be 0 because it is at rest (on the average, of course). There is a ...
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How to determine how deep a piston inside a vessel will move under pressure?

I am revising for the GAMSAT (basically general knowledge across all STEM subjects) and I'd appreciate it if someone could help out with a few physics questions which I am relatively new to, they are ...
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Hydrostatic pressure of watertank, and freezing conditions

I am currently using a hydrostatic pressure sensor inside of a water tank and converting this to liters as per the dimensions of the tank. This works great, however I have hit a challenge. In ...
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How is Torricelli's law different if we change the size of the air vent?

I was wondering how does Torricelli's law vary if the opening at the top of the tank is varied. Most calculations make it given that the tank has a completely open air vent, but how would that change ...
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How big a vaccum pocket would be required to reduce the weight of an object by one kg?

Let's say we have a very light-weight and strong material ( example ), that could be used to create a vacuum pocket. In Earth's atmosphere, such a pocket would be able to lift weight because of ...
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