All Questions
Tagged with classical-mechanics pressure
102
questions
4
votes
1
answer
233
views
Why isn't there a "parallel" Pressure as there is a parallel or shear Stress?
I had this question while I was reading the differences between pressure and stress.
As I have read:
Pressure is the intensity of external forces acting on a point, and it always act normal to the ...
user260844
0
votes
1
answer
295
views
Why does compressible fluid flow choke?
The most common explanation to this phenomenon which I have read is that the pressure disturbance signal cannot propagate upstream, as the medium in which it travels itself flows downstream, so ...
- 34
0
votes
1
answer
96
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Formula for pressure using this equation for force
I have for a plane surface the following equation for force.
$$F(x)=b \rho lxg$$
Where the force moving along the $y$ coordinate doesn’t change. I need to calculate the pressure in an area in the ...
- 11
0
votes
1
answer
329
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Is force due to pressure equally distributed?
Pressure is defined as: $$P=\frac{F}{A}$$
My question is what if we want to find the total force in area of $\frac{A}{2}$. Would be equal to $\frac{F}{2}$? I think that is not true unless we know that ...
- 1,648
2
votes
1
answer
310
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Statistical Mechanics: Particles on a Sphere
$K$ identical particles of mass $m_0$ are bound to move on a sphere of radius R. The system is at equilibrium at temperature $T_0$.
1 - What's the internal energy ($E$)?
2 - What's the specific heat ...
- 23
0
votes
1
answer
41
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Why does the red arrow generate smoke when flying at high speed on a moon rocket?
Why does the red arrow generate smoke when flying at high speed on a moon rocket? I think it is because of the structure, the air in this location has expanded, so the air in this location has ...
- 2,040
0
votes
1
answer
54
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Understanding the relationship between $P=F/A$ in brain ventricles
Humans have a hollow space (see the colored part in the diagram below) inside our brain where cerebrospinal fluid is produced and circulated.
A disease exists called "normal pressure hydrocephalus" ...
- 121
1
vote
0
answers
34
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How can I calculate the pressure at every point under a block, which rests on a slope? [closed]
A cubic block with uniform density $\rho$ and side length $a$ rests on a slope, with one of its face facing directly downwards. The slop is inclined at an angle $\theta$ with the horizontal. Assume ...
- 1,335
1
vote
1
answer
542
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Does water pressure have any effect on the size of a permanent magnet's magnetic field?
If a permanent magnet is dropped into a deep body of fresh water such as Lake Superior, as it descends down, the rising water pressure should continually reduce the size of the magnetic field ...
user217618
0
votes
1
answer
542
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Is the air mass density in the International Space Station (ISS) higher than that on the earth at sea level?
I have read that the atmosphere in the ISS is pressurized to a standard sea-level atmosphere and also of the same composition (ratio of nitrogen and oxygen etc.). What I am struggling to find online ...
- 33
0
votes
1
answer
691
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Is it momentum/force or pressure that determines the damage of an impact?
So a tiny object and a huge object that have the same mass and velocity strike a surface. Because they have the same mass and velocity, they would have the same momentum and will deliver the same ...
- 1
2
votes
1
answer
84
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Why don't comets just vapourize away?
As far as I know, comets are in a freefall around the sun. That would mean, net acceleration due to gravity is almost zero because R =m (g-a) where R is reaction force. Now pressure is force per ...
- 61
0
votes
2
answers
463
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Calculating the power of a pneumatic piston vibrator
I am using a pneumatically-driven piston vibrator to compact a tank filled with granular material. The intensity of the vibrator can be regulated by changing the pressure of the pressurized air fed ...
- 25
1
vote
1
answer
523
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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
5
votes
3
answers
876
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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 ...
- 510