# All Questions

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### Are elements of statistical ensemble fixed or dynamic?

I will use the simplest example I can think of to explain what I am trying to understand. Consider a system with ~$10^{23}$ particles in an equilibrium with fixed values of pressure, volume and ...
21 views

### Time resulting of a thermodynamics effect?

I heard in a documentary that : Irreversibility of time is linked to Heat Dissipation in thermodynamics. The theorist says "passage of time" is only a macro sensation, the underlying effect ...
58 views

### Why is the magnetic unit twice the electric one in CGS?

In CGS system the electric unit is the esu or statcoulomb equal to $2.08*10^9$ charges and two such units repel with a force of $1$ dyne. Magnetic force ratio is $v^2/c^2$, therefore the magnetic ...
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### Field of Solenoid

I was reading this, where in the very beginning I stumbled on the "particle in a solenoid field theme". What's written in there is: The potentianl $\textbf{A}$ is chosen to be that of a solenoid ...
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### Heat transfer direction in fins

I'm unsure of what exactly is changing the heat transfer direction in the triangular fin. $$q_{x} = -kA(x)\frac{dT(x)}{dx} (1)$$ q_{x+dx} = -kA(x)\frac{dT(x)}{dx} - k\frac{d}{dx}[A(x)\frac{dT(x)}{...
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### Optimal axis of rotation of a baseball for lateral movement

Suppose a baseball travels at $90\;\mathrm{mph}$; what is the ideal axis of rotation for lateral movement of the ball? (two-seamer or cutter). So far I think that the following factors play a ...
85 views

### Does electron absorb energy? [on hold]

According to my teacher, an electron is point sized and it does not absorb or release energy. Moreover, my teacher says their orbital absorbs energy rather than the electron. If that is the case, then ...
49 views

### I cannot verify if given transformation is canonical (CT) [on hold]

I'm going on a list of exercises and there's 6 days that I can't figure to this. Prove that given transformation is canonical: $\Large Q=\frac{p}{mw}\sin(\frac{mwq}{P})$; \$\Large P=p\cos(\frac{...
753 views

### Hysteresis and dissipation

Hysteretic phenomena are often linked to dissipation. When there is an hysteresis loop, the dissipated energy can usually be computed as the area of the cycle. For example, in ferromagnetic materials,...
3k views

### What will happen to a permanent magnet if we keep the same magnetic poles of two magnets close together for a long time?

What will happen to permanent magnet's magnetic field or magnetic ability if we keep same magnetic poles of two permanent magnet for long time? Will any magnetic loss happen over the long period of ...