Questions tagged [fluid-statics]

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1answer
47 views

What is the pressure of water after entering atmosphere? [closed]

I was wondering if water exits from the pump and reach the ground, is the pressure of the water at the point of the ground be 0?
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1answer
50 views

Atmospheric pressure in a closed container

it's my first post here but I just have a quick question regarding my fluid mechanics assignment. There's an inverted manometer setup like in the photo which is a closed system. It's given me ...
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3answers
86 views

Will buoyancy act on B? [duplicate]

A is immersed in water, buoyancy must act on A; B is at the bottom of the container, there is no water between B and the container, that is to say, the bottom of B is not in contact with water, so ...
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1answer
47 views

Hydrostatic pressure to measure water level

I am measuring water level in a 25-inch tall vase using hydrostatic pressure. Like this. To do this I have a 1/4 OD inch nylon tube connected to a gauge pressure transducer. So far it has been very ...
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1answer
57 views

Will a piece of ice, floating on water in a beaker, rise or fall when I add oil on top of water? [duplicate]

There is a beaker of water with ice floating on top of it. If I add oil (lighter than water and ice) to it such that it forms a layer above water and ice is suspended between those layers. Does the ...
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0answers
28 views

forces in free liquid surfaces

why the answer does not take into account the area of ​​the sides of the triangle?(F=PA) the vectors on the right side of the triangle what do they indicate? the pressure is not even a vector the ...
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0answers
298 views

Easy derivation of Pascal's Law

I would like to know a simple derivation of Pascal's Law, i.e. why the variation of pressure at a given point of an incompressible fluid also happens to all others.
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1answer
73 views

Size of a raindrop

Thinking about the fact that raindrops come with a typical size I was wondering how this can be determined. I am pretty sure that the friction with air and the quantity of water in the clouds are ...
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1answer
42 views

How does surface tension cause glass plates to attract?

I am having trouble with this example : As it says that the contact angle of the glass water interface is $0^{\circ}$ , so the force due to surface tension should act downward on the plates (rather ...
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1answer
31 views

Effect of increased air pressure on water pressure in sealed container

Imagine I have a plastic bottle filled most of the way with water and with a bicycle pump attached to the top without any leaks... If I increased the air pressure in the top of the bottle to, say, 30 ...
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1answer
50 views

Contact angle of a thin film problem

I am having a hard time with problem 8 , so can anyone give me some hints. I'll say the things I have in mind I can use the Laplace pressure difference equation to find the the excess inside pressure....
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1answer
23 views

Can a pressure wave induce pressure in a liquid it's propagating through?

I have a piece of cylindrical plastic container containing a liquid and sealed at all ends. The bottom seal is a flexible material that can be broken with enough force. The question is then is: can I ...
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0answers
21 views

Hydrostatic pressure

The solvent in which porous structure will create higher hydrostatic pressure at the beginning of the solvent removal process? I have two porous cakes, A and B with different height. A is 9.6 cm and B ...
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1answer
62 views

Height of fluid and pressure

It’s a well known fact that pressure at bottom of the contain depends on height of the fluid column above it. If I add a ultra thin capillary tube as a fifth tube, then height of the water column ...
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5answers
315 views

Does Archimedes principle account for depth?

The principle states that the upthrust acting on an object is equal to the weight of the fluid displaced by the object. However, this to me suggests that no matter how deep an object is immersed in ...
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0answers
47 views

How does Bullheading work?

Bullheading, a method of Well Kill, involves simply pumping the kill fluid (heavy fluid) directly down the well bore forcing the well bore fluids back into the reservoir, does the heavier fluid flip ...
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0answers
78 views

Does tilting a liquid develop shear stress on its surfaces?

Please help me these confusions I have. If I tilt a cuboidal container containing an ideal fluid (non viscous liquid), does a shear stress develop on the liquid due to some shearing force acting ...
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0answers
16 views

Does angle of contact remain constant for rise of liquid in a tube of insufficient length?

My book states that for rise of liquid in a capillary tube of insufficient length h * R (radius of curvature) = constant. Since the tube is of insufficient height radius of curvature increases to ...
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1answer
32 views

Force on the base of a container

There are 3 containers ,having the same base area ,having being filled with the liquid of same density to the same volume as shown in the figure. What will be the force exerted on the base in each ...
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5answers
366 views

If atmospheric pressure is 76 cm of $\text{Hg}$ , why won't 76 cm of mercury stay in an open tube when suspended in air?

If we keep an hold a tube in air with the closed end up and open end downwards, containing mercury upto a length of 76 cm, why does the mercury not stay in place? Shouldn't atmospheric pressure exert ...
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1answer
27 views

What is the minimum amount of matter do I need to call it “bulk” matter?

I had been reading about bulk properties, but was confused what should the minimum amount of matter be for these properties to hold. For eg: Intensive thermodynamic variables will not remain ...
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1answer
46 views

Normal force on a fluid container [closed]

I was solving some problems and came across the following situation. Consider a container with one cylinder on top of the other. Area of cross section is $2A$ and $A$ for the bottom and top cylinder ...
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0answers
70 views

Hydrostatic forces of water spilling over gravity wall with slant sides

I want to calculate the horizontal and vertical components of hydrostatic forces on section of the dam. I understand that the force of water on the upstream surface is the same as when the side is ...
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2answers
68 views

Buoyancy question

Suppose we have a ball of volume V and a block of the same volume V whith same density. We submerge the ball into some kind of liquid so that $\frac{1}{2}V$ is submerged into the liquid. We do the ...
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5answers
216 views

Why can water be sprayed farther when the pipe outlet is narrowed?

Someone told me: This is because the flow rate remains unchanged, so the flow rate of small diameter pipelines is faster. I don't think this explanation is right: the diameter of the pipe outlet is ...
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2answers
36 views

Which way does the fluid flow? [closed]

In the given siphon arrangement if a hole is made at D, will water leak out or will air leak in? I think air should leak in as fluids flow from high to low pressure but I'm not sure... Any help ...
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1answer
243 views

Buoyant force when object is between two liquids

Suppose we have a ball floating in liquid A. Then we pour a liquid B on top of the ball (Assuming that the liquid is poured such that the ball doesn't oscillate) . The ball rises up. Why? According ...
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2answers
809 views

Does capillary rise violate hydrostatic paradox?

If $p$ is a pressure and $p_A = p_{\text{atm}} + hdg,\,$ $p_B = p_{\text{atm}}$, is hydrostatic paradox violated, shouldn't $p_A=p_B$?
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2answers
74 views

Bernoulli equation: how should one imagine $\frac{p}{\rho}$?

The Bernoulli equation states the following $$ \frac{1}{2}u^2 + \frac{p}{\rho}+ gz = \text{constant along a streamline} $$ where: $u$ is the fluid flow speed at a point on a streamline, $g$ is ...
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3answers
58 views

What is the physical origin of buoyancy?

Imagine a horizontal cross-section $\Delta S$ of a cylinder containing a liquid of density $\rho$. The downward pressure on $\Delta S$ at the depth $d$ from the surface of the liquid is $P_{down}=\rho ...
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1answer
22 views

Horizontal force on a fluid surface

I was doing some problems involving calculating the thrust due to pressure on curved surfaces. One way, of course, was to integrate over the surface to find the thrust. I noticed that the answer ...
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3answers
70 views

Fluid mechanics - pressure [closed]

We know that pressure inside a container depends on depth. My question is that if this true then if I fill water in a one end closed pipe which has diameter of 2cm and height is 4m and if I fill the ...
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0answers
80 views

Why does P = $\rho$gh seem to contradict equal accelerations of fluids in a closed U tube?

This is based on a problem. The closed U tube is as shown : I want to figure out time period of small oscillations if the liquid interface is slightly disturbed. My take : considering an ...
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2answers
67 views

Hydrostatic Paradox - weighing issue

In the picture below, both tubes have the same pressure at the bottom. I understand that if they were weighed individually, they would show a different result since the water on the second tube is ...
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1answer
274 views

How to calculate the specific weight of air?

First of all sorry for my bad English ... I have to calculate the specific weight of air knowing that in the air there is actually a small percentage of water vapor. Therefore the specific weight of ...
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1answer
24 views

Is there a relation between the pressure at a point in a fluid and the pressure on the surface of a horizontal object placed at the same point? [duplicate]

So if the pressure in a large fish tank 10 meters below water surface is 50 Glitches (didn't have a realistic number so I put an unrealistic unit), and a Pancake batfish stands still there for a while,...
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1answer
59 views

Drinking Straw physics [duplicate]

I was just wondering, when you put a straw in water and block the top, water doesn't get out from the bottom when you lift it up. What about alcohol like Vodka ( ethanol )? I am trying to make a ...
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1answer
34 views

Forces in a hydraulic lift

My answer states that the force applied is the same for 1 and 3 but less than the one in 2. I understand why 2 is greater than 1 but do not understand why 1 and 3 are the same when 3 has double the ...
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0answers
72 views

Integrating to find net pressure and force on a sphere by a fluid

How would I go about solving for the net force on a sphere exerted by air pressure as a result of pressure being dependent only on the vertical position of the ball? When the sphere it is placed in a ...
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1answer
61 views

Potential energy of ice cube is container dependent?

The potential energy of an ice cube floating at sea can be measured from the surface of the water, which remains at a constant height as you drop the ice. However, what about when you drop it into a ...
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2answers
97 views

Fluid statics - buoyancy force problem

The pictures above show the question and soution. The part I don't understand is why the air pressure is acting upwards against the plate instead of downwards on the water. Could someone explain this ...
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0answers
34 views

Can an ideal fluid be at rest in a non conservative body force field?

We know that, when an ideal fluid is at rest, then the body force density is equal to the gradient of the pressure. But, that means body force should be conservative. So, does it mean fluid can't be ...
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0answers
47 views

Derive the virial theorem from hydrostatic equikibrium

Consider the equation of hydrostatic equilibirium as follows as applied to a stellar object: $$ \frac{dP}{dr } = \frac{-GM\rho}{r^2} $$ I know it is intimately related to the virial theorem but I ...
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2answers
126 views

Bouyant Force Confusion [closed]

I was asked to solve the question in the picture I naturally thought the answer was (1) because bouyant force is caused by the pressure difference on the object's top and bottom surfaces. Turns out ...
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2answers
52 views

Hydrostatic Condition in Fluid

If we provide constant velocity to the partially filled container then the liquid present in the container is in the hydrostatic condition or not. I think since velocity is constant then there is no ...
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0answers
74 views

Derivation of height of a liquid in a capillary tube

I was going through the derivation of height of a liquid in a capillary tube when I came up with a doubt...although its a very basic doubt and you may laugh at it...but please help me...I was thinking ...
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1answer
58 views

Why we consider pressure do not vary with height incase a gas in a vessel?

Why pressure do not vary with respect to height incase a gas contained in a vessel and atmospheric air pressure varies with respect to height. for example we consider constant pressure in a mercury ...
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1answer
85 views

Why is pressure greater at the bottom end of a box submerged in water?

It is my understanding that the pressure acting on the bottom end of the box would be greater than on the top. But if we place a box under water, then the height of water above the top end of the box ...
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1answer
42 views

Bouyancy of ozone gas

If ozone is $O_3$ why is it an outer layer of the atmosphere? It seems $O_3$ would sink in a solution of $O_2$, rather than float on it.
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2answers
69 views

If I immerse a coin in a cup of water, help me define the forces acting on it

So the coin is hanging in an equilibrium position midway in the water filled cup, concerning the force acting on the upper face of the coin, I define it as F=mg where m is the weight of the water ...