All Questions
Tagged with momentum thermodynamics
23
questions
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Definition of temperature as variance of the momentum
I have always taken the definition of temperature to be the kinetic energy Statistical mechanics definition of temperature as the average kinetic energy.
However I have been reading a paper where the ...
- 101
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1
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772
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Optimisation of pop pop boat?
This beautiful video of Steve Mould explains the working of a pop pop boat using a glass boat.
Now he explains that the pop pop boat doesn't move because of ejecting water in one direction like a ...
- 145
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119
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How small is $dt$ in this derivation of the kinetic energy of ideal gasses?
I was reading the derivation of the average translational kinetic energy of an ideal gas in Sears and Zemansky's University Physics. This derivation uses a cylinder with height
$|v_{x}|dt$ and base ...
- 65
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5
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1k
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How do we explain the motion of a time-reversed emptying balloon in vacuum?
Imagine a balloon filled with air, let loose in outer space. There is an imbalance of pressure pushing to the insides of the balloon, and this imbalance is the motor of motion. There is no pressure in ...
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1
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Is it possible to compress gas without making it hotter?
First of all, this is just a purely theoretical thought experiment:
Let us consider another situation. Suppose that the piston moves
inward, so that the atoms are slowly compressed into a smaller ...
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-1
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1
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326
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Why we dont consider momentum of gas when tackling any specific thermodynamics problems?
Suppose in a gaseous container we have two movable pistons , consider its moving with speeds u and v and between them is the monoatomic gas , now at later time its temperature might increase , when we ...
- 512
1
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1
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76
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Velocity of a particle colliding with the surface of a pistone [closed]
I am trying to understand how the following result is true.
If we have a particle moving in x direction with velocity $v_1$ and a wall moving in the x direction with a smaller velocity $u$, the ...
- 1,398
1
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1
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155
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How can an object lose energy but still move at the same speed with constant momentum?
I'm studying collisions, and while doing it, the conservation of momentum seems to strike me in a weird way.
If the momentum in a system is constant but energy can still be lost through thermal ...
- 13
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197
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How to find the change of temperature in a inelastic collision? [closed]
I've found a very intricate task, that I have found no answer for on the internet:
A meteorite (m = 75000kg, velocity = 13000km/h, c = 800J/(kgK)) crashes into ...
0
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1
answer
124
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Does a rotating rigid ring (or other rotating rigid body) in space generate heat?
I don't have training in physics (so forgive me if I use the wrong terms or mix up concepts), but I was thinking about “artificial gravity” in space. If a spaceship were being propelled by some force, ...
2
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1
answer
167
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Why are momentum and angular momentum not state quantities in thermodynamics?
I am recently studying thermodynamics and was wondering if energy is a state quantity, why aren't momentum and angular momentum? I feel like they are always zero at equilibrium in ideal gas based on ...
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3
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874
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How does the piston inside the cylinder exactly behave during an isothermal expansion?
Let us say we have a perfect gas in a cylinder with a piston, with section $A$. We place the cylinder over a thermal reservoir at a certain temperature. Gradually, assuming an isothermal process, ...
- 1,292
3
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3
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The force exerted by a single molecule
In the chapter of the kinetic theory of gases in a basics undergraduate physics book, it says the force exerted by a single molecule on a wall is calculated as $F = \frac{\Delta p}{\Delta t} = \frac{...
- 157
2
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2
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Why is the relation between coefficient of restitution and air pressure of a basketball logarithmic?
Perhaps this is due to the spherical shape of the ball but yea, i've conducted the experiment for school and i'm trying to work through justifying this but need assistance.
edit: here's the data
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Is There a Limit to The Energy-density Confined to a Black-hole Structure, Consisting of a Schwarzschild Sphere? [closed]
Imagine two particles repeatedly colliding with increasing momentum,like a dense collection of particles confined within the envelope of a collapsing star that's close to becoming a black hole.
Is ...
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