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As you probably know, one of the postulates Einstein's Special Relativity is based on is that all observers see light in vacuum go at the same speed $c$. Now consider a lamp at rest relative to Jo...
All given metrics are for orthonormal-basis. 2 dimensional spacetime : I saw that Minkowski Metric looks like this : $$\pmatrix{-1 & 0 \\ 0 & 1}$$ or $$\pmatrix{1 & 0 \\ 0 & -1}...
It depends on what you want from your calendar. If you simply want a way to keep track of time, then you can base it on anything you like. The earth spinning on its axis, the moon orbiting the ea...
A particle is subjected to the potential V (x) = −F x, where F is a constant. The particle travels from x = 0 to x = a in a time interval t0 . Assume the motion of the particle can be expressed i...
To understand virtual work you should understand virtual displacement first, The wiki I have linked in first paragraph describes virtual displacement deeply. Usually we write $\delta$ or $d$ to sa...
$$F=F(q,p,t)$$ $$\frac{dF}{dt}=\frac{\partial F}{\partial q}\frac{\partial q}{\partial t}+\frac{\partial F}{\partial p}\frac{\partial p}{\partial t}+\frac{\partial F}{\partial t}$$ $$=\frac{\part...
Modern physics has pretty much dismissed the concept of the ether. Any modern claim that something like the luminiferous aether exists would be up against mountains of experimental results indicati...
Actually $\mathcal O$ is some standard point and $r$ is where potential depends on. $$V(b)-V(a)=-\int_{\mathcal{O}}^B \vec E \cdot d\vec l +\int_{\mathcal{O}}^A \vec E \cdot d\vec l $$ $$ =-\int_{...
Order and disorder aren't scientifically precise terms. In this context, they're an attempt to make the idea of entropy more intuitive. A configuration could appear orderly just by chance, yet be h...
I was wondering what's the physical meaning of Laplace operator. $\vec\nabla$ actually represent a field. I had seen that Laplace operator is written as $\vec \nabla \cdot \vec\nabla=\nabla^2=\Delt...
I have a circuit like this. And, I want to calculate resistance from here. I was following these steps. I was calculating resistance for left side circuit. $$R_1=\frac{2 × 2}{2+2+4}=0.5\Omega$$...
In SE sites, homework-and-exercises question isn't allowed in Physics SE. So, I want to know does Codidact also mark home-and-exercises question as off-topic? I have earlier asked twice question on...
While electrons have positive and protons have negative charge. They should collide and vanish, shouldn't they? No. They have other attributes than just being packets of charge. You have to cons...
The major advantage of Alternating Current is that it can be transmitted to large distances without significant losses, which is not possible in Direct Current. Had economical superconducting wire...
In my Physics Codidact profile I am getting that I got 1 downvotes. I am not sure if I asked a question earlier in which I got 1 downvotes. In my current posts I don't have any downvotes or upvot...
$$L'=\frac{m}{2}(a\dot{x}^2+2b\dot{x}{y}+c\dot{y}^2)-\frac{k}{2}(ax^2+2bxy+cy^2)$$where a, b, and c are arbitrary constants but subject to the condition that $b^2 − ac \ne 0$. What are the equat...
If a signal has a analog component then it analog regardless of if it has a digital component.
In signal processing, are signals modeled in only one way (digitally or analogously) or are there some signals which can be modeled in both ways?
This gravitational field we move inside has some distance L after which it becomes 0.Before L it is just like any gravitational field. Suppose we move inside that gravitational field.The accelerat...
The universe could possibly wrap back onto itself, or it could be in infinite flat space. Imagine the difference between being on an infinite plane, or on the surface of a large sphere. In both o...
We know that electrons always repel electrons. But, if somehow they collide, then what will happen? I found a related question of above one in Quora. An incoming electron can instead make them ...
Why abilities don't show in every user page? Take a look at @Mithrandir's profile according to his profile he doesn't have any ability. But, I don't think that he doesn't have ability. I was checki...
Magic.. :D The question was reopened but, showing closed instead of reopened (It should show last_activity according to code). question link
Using imaginary magnetic charges (usually called magnetic monopoles) to solve for forces between two magnets doesn't make sense. Even if magnetic monopoles existed, what exactly do you envision do...
In my notes from University the reason a material can exhibit superconducting properties is at really low temperatures electrons form Cooper pairs of which the electrons of the Cooper pairs have lo...
