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1 vote
2 answers
66 views

Work performed by hydrostatic pressure

One should be able to show mathematically that the hydrostatic work done by an environment on an object undergoing a volume change $\Delta v$ should be $p \Delta v$, where $p$ is the (constant) ...
5 votes
3 answers
876 views

Why does air get trapped below water pouring into a glass?

The drinking-water-tap at my workplace has a low pressure continuous stream of water. When I pour water into a glass which has at least about (depth) 5cm of water in it, surprisingly large air bubbles ...
1 vote
1 answer
49 views

Finding Exterior Confining Pressure from Interior Pressure Point for a Solid Disk

Essentially, I've been wrapping the pictured object tightly with string to exert a confinement pressure on its exterior. It's been difficult however to make a good estimate of how much pressure is ...
0 votes
2 answers
66 views

Stress tensor from forces

Consider a body that is acted on by a variable external force density $\vec{f}(\vec{r})$. I want to know what the pressure and shear stress would be within the body as a result of these external ...
1 vote
2 answers
381 views

Deformation of a self-gravitating sphere from two forces

I have a fluid sphere (say a gas or a liquid of uniform density, under its own gravity) on which forces is applied to its surface. I would like to find its approximate shape (most probably an oblate ...
2 votes
2 answers
329 views

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 ...
0 votes
1 answer
248 views

Dissolving air in water using a bicycle pump

Forgive me if this is dumb. I connect the bicycle pump tube through a hole in a water bottle cap (half-filled with water) and place it in the water and then completely seal the setup. Then I press ...
0 votes
0 answers
48 views

Fluid Pressure on a curved surface

In this question (b) , I was not able to understand why the upward thrust on the flat surface of the hemisphere will be piR^3, because the "2/3 pi R^3" amount of water has been occupied by ...
0 votes
0 answers
47 views

Problem while calculing the bending torque of internal air pressure in a soft actuator

this is a question I cant resolve while looking a paper I needed for my undergraduate thesis. In this image (from Modeling of Soft Fiber-Reinforced Bending Actuators, Panagiotis Polygerinos et al.), ...
5 votes
2 answers
256 views

Help me understand extreme pressure

So we have the tragedy of the submersible being lost near the Titanic site. I am trying to understand the pressure the vessel was under. I have heard the "$1$ atmosphere for every $10$ meters&...
0 votes
2 answers
84 views

Isotropy of fluids vs. hydrostatic pressure (conflicting concepts to me)

The formula for absolute hydrostatic pressure on Earth is $$ p = ρgh + p_{atm}, $$ where $ρ$ is the density of the liquid, $g$ is the gravitational acceleration, $h$ is the depth of the liquid, and $...
1 vote
2 answers
223 views

Why the $\Delta$ in the definition of pressure? (fluid mechanics)

I'm an engineering student (first year) studying Physics 1 (now an introduction to fluid mechanics). Q1 In my physics textbook, the "medium pressure" is defined as: $$p_m = \frac{\Delta F_{\...
0 votes
1 answer
218 views

Pressure force exerted by one half of the sphere into his other half

lets say we have some sphere under some pressure and I want to find what is the force pressing one-half of the sphere toward the opposite half?,lets take one piece of area then the pressure force ...
1 vote
2 answers
209 views

How is pressure affected by horizontal force in fluid?

In the situation shown above, Point A is just near the wall at negligible distance. But how is pressure at A is due to weight of water and atmospheric pressure only,why does it not have any pressure ...
0 votes
1 answer
169 views

Pressure exerted by a photon

According to several sources, momentum of a photon is $\dfrac{h}{\lambda}$. While doing some reading on radiation pressure. I came across this wikipedia page where it was stated that "pressure ...

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