All Questions
21
questions
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 ...
- 374
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&...
- 153
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 $...
- 81
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_{\...
- 141
9
votes
3
answers
2k
views
Why does the Pascal's barrel experiment need a tall column of water?
This question is based on the content of this video .
The experiment consists of putting a tall, thin column of liquid on top of a barrel filled with water, so that the pressure caused by the large ...
0
votes
1
answer
36
views
Support Reactions of Columns placed on Hydraulic bed (same pressure) with Unequal Loading
Suppose columns are supported on a deck with hydraulic cylinders which are coupled together with the same pressure. These columns are loaded with unequal loads F1 and F2 (F1 > F2). Will the ...
3
votes
1
answer
986
views
Pressure inside a soap bubble made in a vacuum
A question I came across:
A soap bubble is made in vacuum by blowing an ideal diatomic gas in it. Assume the heat capacity of the soap film is much greater than that of the gas in the bubble. What ...
- 153
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 ...
3
votes
4
answers
2k
views
Pressure inside when a container is closed
Let us suppose that there is a container with its lid open sitting at the bottom of an ocean. The pressure at the bottom of the container will depend on the water column above it assuming only static ...
- 163
0
votes
2
answers
41
views
At what rate does oxygen un-dissolve after releasing pressure?
I have a soda bottle (consider no leaks) at room temperature and 55 psi. Oxygen is saturated in the water inside. After removing the cap, what law or formula can I use to estimate the time oxygen ...
- 340
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 ...
- 340
1
vote
1
answer
523
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 ...
- 175
1
vote
2
answers
108
views
Physical meaning of variation of force of pressure with altitude in fluid
We usually prove that pressure is a function altitute Z. Imagine a cube in a fluid, then the force of pressure on the bottom surface is higher than the force of pressure on the top surface. But we don'...
0
votes
1
answer
580
views
Does venturi effect violate pascal's law?
If we use Bernouill's law to compare pressure between point 1 and point 2, we find that P(2)gdH=0, we conclute P(2)=P(1).
I must have made a mistake but where is?
4
votes
2
answers
7k
views
Concept of surface tension: excess pressure inside an air bubble in a tank of water
I know the expression for excess pressure inside a LIQUID DROP is :
$$
P_2 - P_1 = 2S/R
$$
where $P_2$ is the pressure just inside the liquid drop and $P_1$ is the pressure outside the liquid drop ...
- 329