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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...
Edit: While this specific case isn't reproducible, there is a broader problem. This section is sometimes not showing up for people with moderator privileges, on some communities, and I don't yet k...
In classical physics book of kleppner, i read that An atom can "jump" from one stationary state a to a lower b by emitting radiation with $E_a-E_b$. The frequency of the emitted "package of radi...
I know this is a bit late, but if you still haven't figured it out, here goes: Firstly, let the mass per unit area of the disk be $\sigma = \frac{m}{\pi R^2}$. Consider a small element of area $d...
May it be that there are more than 8/9 planets in our solar system which aren't detectable with the current technologies? Is there any theory suggesting that our solar system has more planets, all...
In the lab I changed the angle the light hits a photoresistor and it doesnt obey Lambert's cosine law the conductivity of the photoresistor drops fast from +-20 to +-30 degrees angle.Why?
I'm interested in knowing the surface temperature of both sides of a double-pane or triple-pane window. Given the R-value of the window, and the air temps outside and inside, how can I calculate t...
The "R value" of insulation is its thermal resistance. It tells you how much of a temperature difference is required to transfer a certain amount of heat power per unit area. The R-value you see ...
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...
Your list of potential failure modes seems pretty comprehensive. The dowel could shear, rip through the wood, or the board itself might break. To determine which will happen first, you need to cons...
