All Questions
Tagged with classical-mechanics pressure
102
questions
2
votes
2
answers
164
views
Is pressure exerted by different forces on a fluid particle same? [closed]
If the closed container containing the fluid (not any air) is moving with some acceleration, can pressure due to a fluid particle's weight be equal to pressure due to a force exerted by another fluid ...
- 21
1
vote
1
answer
66
views
Amplifying stress at near perfect vacuum?
So, I've got a vacuum chamber as part of a home freeze drying project. It is a cylindrical steel pot with a 1.5in acrylic lid. The manual is poorly translated from Chinese, so some of it is seemingly ...
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?
2
votes
5
answers
1k
views
Woodworking clamps, does force add up?
I was watching a woodworking video about glue, and the guy was clamping two pieces of wood together using a total of 8 clamps. He argued that by doing so he would apply 8 times the maximum force of ...
- 123
0
votes
2
answers
1k
views
Above-the-ground pool slope pressure calculation
I'm not sure this is the right place to ask this "homework" question, but I have a real life problem that requires calculation and I do not have the math knowledge to make them myself.
I have bought ...
- 109
1
vote
3
answers
2k
views
Can you sail up/down a moving river on a windless day?
It's not possible to sail into the wind directly, but only at an angle. It can be shown (it may help for below) by considering the pressure forces on a flat sail and flat keel that sailing upwind is ...
- 274
1
vote
1
answer
754
views
Water Balloon Under the Ocean
If I were to inflate a balloon with Helium inside it and were to leave the balloon under the water,will the balloon fly high in the sky cutting its way through water.If it does or doesn't somebody ...
- 167
0
votes
1
answer
74
views
What's the difference between dP<0 and dP>0?
Assume a situation shown in the image1 below. The column is filled with gas. The number density is denoted as $n$, and the mass of each particle is $m$. Take the axis downward. By considering the ...
- 433
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
0
votes
1
answer
429
views
"Non-smooth" flow of liquid poured from a milk carton
With milk poured from a newly opened carton, I have observed over the years that the flow of the liquid starts off flowing smoothly and continuously but after some time t becomes "sporadic" in such a ...
- 889
0
votes
1
answer
3k
views
Bernoulli's Principle and Water Hoses
I am having trouble understanding the relationship between fluid velocity and pressure in a defined space such as a hose, pipe, etc. I understand that, by Bernoulli's Principle, the pressure of a ...
0
votes
1
answer
20
views
How do you draw the force in a clamped connection of 2 cilinders?
Something like this:
There is pressure between the cilinders, and for some calculations we use the formula p=F/A, therefore F=p*A
If you were to draw the force F, where would you draw it?
If the ...
- 139
-1
votes
1
answer
159
views
Using dimensional analysis to guess formula ; too many flaws? [duplicate]
A horizontal pipe of uniform cross sectional area A empties into a bucket, filling it at a rate R(unit volume per unit time). The speed of the fluid within the pipe is v. Guess a formula for the ...
- 254
-1
votes
1
answer
555
views
Membrane shape under pressure
If I have a circular membrane that is fixed by the edges and then I apply a uniform pressure to the membrane (let's say the membrane is the top of a circular chamber that has a rigid wall and flat ...
