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Undergraduate Physics Student. México. $$\partial^{\mu}\partial_{\mu}\phi(x)+m^{2}\phi(x)=0$$


4h
comment Isothermal Gas Expansion, a Reversible or Irreversible process?
I know that the process is not a cycle. But in order to find out if the process is reversible or not, I must know what would happen if I return to the initial state. Finally, can you make me a favor? Which book can you suggest me to read about that fact involving the pressures (external & internal)? I've never listened that. Thanks.
16h
comment Isothermal Gas Expansion, a Reversible or Irreversible process?
I don't understand why you say that. According to Blundell (Thermal Physics), the expression $đW=-pdV$ can be used only in a reversible process. Also I understand that "in a reversible cycle, the system and its surroundings will be exactly the same after each cycle". that's why I'm asking for the $Q$'s. Because they are equal then I'll conclude that the process is reversible.
19h
comment Isothermal Gas Expansion, a Reversible or Irreversible process?
I edited my question @Manishearth
1d
revised Isothermal Gas Expansion, a Reversible or Irreversible process?
added 418 characters in body; edited title
1d
comment Isothermal Gas Expansion, a Reversible or Irreversible process?
I better edit the title. @Manishearth
1d
comment Isothermal Gas Expansion, a Reversible or Irreversible process?
OK, I'll edit my question @Manishearth
1d
asked Isothermal Gas Expansion, a Reversible or Irreversible process?
1d
asked Is this an exact differential or not?
May
16
comment Finding radioactive nucleus given table of values
@UnkleRhaukus No, I don't. How can I calculate those errors?
May
16
accepted Finding radioactive nucleus given table of values
May
16
comment Finding radioactive nucleus given table of values
So, I suppose the corresponding isotope would be $^{131}I$, with $T_{1/2}=8.04\ d$.
May
16
asked Finding radioactive nucleus given table of values
May
13
accepted Should the expression for energy conservation in alpha decay include the mass of electrons?
May
13
accepted Mathematical proof of non-negative change of entropy $\Delta S\geq0$
May
13
accepted Integrating factor $1/T$ in 2nd Law of Thermodynamics
May
13
accepted Energy conservation in nuclear reactions and radiactive decay
May
13
comment Mathematical equivalence between Liénard-Wiechert potential and 4-potential in Rindler coordinates
You mean for an accelerated charge? I think I should'n because when I make the change of coordinates, physically it mans I'm changing my inertial reference frame for an accelerated one. So in the accelerated frame I'll see the charge moving with uniform velocity.
May
13
comment First law of thermodynamics?
$Q$ is the amounts of heat supplied to the system, and $W$ is the work done by the system on its surroundings. If $W<0$ then the work is done upon the system by its surroundings. Similarly with $Q$.
May
13
comment Thermodynamics, PV diagrams?
You mean that It doesn't matter if during the process the temperature changes because $p=p(T,V)$ and you are only integrating over $V$?
May
13
comment Mathematical equivalence between Liénard-Wiechert potential and 4-potential in Rindler coordinates
@firtree Oh, I think I get it. In this case I must transform the Liénard-Wiechert potential using Rindler change of coordinates and I should obtain the $A_\tau$ and $A_Z$, right?