All Questions
Tagged with newtonian-gravity thermodynamics
43
questions
6
votes
6
answers
3k
views
Why is pressure in the outermost layer of a star lower than at its center?
I have done the math and I have obtained the hydrostatic pressure in a star is lower at the outermost layer of a star than in its center, where the pressure is actually maximum. Although the equations ...
- 1,619
5
votes
2
answers
289
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Helium in Uranus atmosphere
I read that in 1986 Voyager 2 measured the composition of Uranus' atmosphere, which turned out to be composed of $85 \%$ hydrogen and $15 \%$ helium.
It's not clear to me how this relevant amount of ...
- 566
0
votes
0
answers
16
views
Surface Tension vs. Gravity: Finding the Critical Length Scale
I'm studying Kardar's "Statistical mechanics of particles" book and tackled a problem. After solving it, I checked Kardar's solution and found that he has different approach. I'm interested ...
- 31
0
votes
3
answers
75
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Does work done by gravity (alone) heat things up?
If we take the first law of thermodynamics:
$$ΔQ = ΔU+ΔW$$
And we consider a system of a ball falling from height $h$ in an Earth-like gravitational field(no air drag and $h$<<$Rₑ$)
$$ΔU = mgh$$ ...
- 11
1
vote
0
answers
50
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Would a candle in very high gravity blow itself out?
A candle creates an upward draft of hot air, without which the flame would be spherical. The buoyancy generated is proportional to the density difference as well as the strength of gravity.
Suppose a ...
- 6,531
0
votes
1
answer
39
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Amount of extension of the metal rods in the same system
If we heated two identical metal rod both vertically and horizontally, we would observe that it expands. However, if the rod is placed vertically, gravity will indeed play a role. The expansion of the ...
- 9
2
votes
1
answer
94
views
How long does it take for gas to settle down under earth's gravity?
I was discussing about ideal gas with my colleague the other day, and these questions come up in our conversation.
Lets say we have 1 mole ideal gas in a perfectly insulating cube box of size $1m^3$,...
- 170
-1
votes
1
answer
117
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How to add Newton's constant to the metric function?
My main question is, is it possible to manually add Newton's constant $G$ to the metric function of a black hole? Is there such a possibility for Black Brane? How to add? Should it be added to the ...
- 65
1
vote
1
answer
94
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Temperature of a particle moving in a gravity field
I have a seemingly simple question that is still puzzling to me.
The temperature of an atom is proportional to its kinetic energy. If an atom now moves upwards in a gravity field, its kinetic energy ...
- 193
2
votes
2
answers
304
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Is osmosis stronger or weaker than gravity, and by how much?
Suppose you perpare a jar of salt water and another of sugar water and invert one on top of the other with a divider between them, and then carefully remove that divider so the liquids are in contact.
...
- 123
0
votes
1
answer
56
views
Gravity train in other planets?
A Gravity train (https://en.wikipedia.org/wiki/Gravity_train) goes through a tunnel inside a planet that connects point A with point B. On Earth, the train would not gain enough impulse to reach the ...
- 2,466
0
votes
2
answers
97
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Could gravity be used to cool down matter?
Thermal energy being the movements of particles, could we have a system that could use gravity to reduce the thermal energy of particles?
For example, if we imagine:
A box containing Argon in its ...
- 101
0
votes
1
answer
46
views
When a star loses temperature its matter loses KE so does it mean the star's gravity weaken?
When a star loses temperature its matter loses KE so does it mean the star's gravity weaken? The question is based on Einstein's field equation which states that energy also contributes in space-time ...
- 1,825
1
vote
2
answers
484
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How does gravitational potential energy pertain to a single gas particle escaping the atmosphere?
What's the effective difference between a helium molecule moving at 11.18 km/s and one moving at 11.2 km/s at the edge of the atmosphere? Is the idea that, with a particle moving just below the ...
- 31
9
votes
7
answers
14k
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What is gravity's relationship with atmospheric pressure?
I'm asking for clarification here. If Earth had the same atmospheric mass per square unit of ground but the Earth had suddenly gained mass so it had twice the gravity at the surface, would the Earth ...
- 227