Questions tagged [energy]
Energy is the conserved quantity associated to time-translation invariance and represents the work a system is capable of doing. Use this tag for questions about energy, and consider adding the [energy-conservation] tag if it is specifically about its conservation.
9 questions from the last 7 days
1vote
0answers
39views
Can vacuum shift to a higher energy level?
From this, I gather that a false vacuum can decay to a false vacuum of a lower energy. AFAIU vacuum decay is always local, propagating at the speed of light (whence the reference to the expanding ...
- 119
0votes
0answers
44views
Relation between kinetic energy/momentum and space/time [closed]
I would like to understand kinetic energy and momentum better. Especially how they are related to space and time. The momentum of a particle equals the impulse that accelerated it from rest to its ...
- 149
0votes
1answer
59views
How cold would it “feel” floating in space in Earth’s orbit? What`s the “effective temperature”?
So, space is cold but there is very little particles to transfer heat away from you in near vacuum. At the same time, the Sun is able to heat the surface of the Earth to temperatures of 50+ degrees ...
- 395
2votes
0answers
41views
Relationship between momentum and probability current in Dirac equation
I would expect that for a given eigenstate with energy $E$, the density of momentum $\mathbf{p}$ and the probability current $\mathbf{j}$ at any point would be related as: $\mathbf{p}=\frac{E}{c^2}\...
- 451
-1votes
0answers
36views
Kinetic energy and reference frames [duplicate]
Speed is relative i.e. different frames of reference can measure different speeds of a body. This means that kinetic energy is also relative. So does it mean a frame of reference can measure the ...
5votes
2answers
172views
Which laws of nature prohibit harvesting neutrino energy?
Updated in response to comments There is an old question on Skeptics SE, "Can electricity be obtained from neutrino radiation, like a solar cell?". It's about a company's claim to have the ...
- 389
4votes
2answers
424views
Derivation regarding Gibbs free energy
I'm a beginner, learning things like entropy and gibbs free energy for the first time. I'm trying to derive the famous equation: $$ΔG=ΔH-TΔS$$ but it looks like I'm getting nowhere. I start by ...
-11votes
0answers
42views
¿Que tan posible seria liberar y materializar energia interna como dice a continuación? [closed]
La Liberación Controlada de Energía Interna para la Generación de Fuerza Física: Propuesta Teórica de un Sistema de Control Biocuantico Autor: Thiago [Apellido] Resumen Este trabajo explora la ...
2votes
1answer
70views
Which photons count per second? [closed]
Since light interferes with itself constructively or destructively, is it more accurate to understand the relation between an increase of intensity (and therefore amplitude) and the number of photons ...
- 121
