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The most famous formula of this kind is Bloch's $T^{3/2}$ law: $$M(T)=M_0 \left( 1-\left(\frac{T}{T_c}\right)^{3/2}\right)$$ It is a low-order approximation for the spontaneous magnetization in i...
Initially, if I apply forces of 20 N and 15 N directly at the ends of a massless string (without any pulley or masses), the tension in the string is exactly 15 N, as expected. No, it's not. You'v...
$x(t)=a\cdot \sin(t\sqrt{k/m})$ is the only solution that satisfies $x(0)=0$. If you then impose $x(c)=0$, you only get solutions for certain values of $k$. These values are the eigenvalues of the ...
Suppose we have a gravitational wave which obeys the equation: $[G_{tt}-c^{2}G_{xx}]h_{\mu\nu}=0$ Lets take the case where $h_{\mu\nu}\ne0$ so we are left with the classical wave equation.Suppose...
A computer can store some number $n$ of bits in memory, and it can perform some number $m$ of essential computational operations, such as addition or multiplication, and rewrite those bits to memor...
I have been working on a theoretical framework that draws on concepts from conformal field theory (CFT) to describe fluid dynamics and could potentially be well suited for describing certain turbul...
There is so much to unpack here. I am going to start this post and will keep adding to it as I get more thoughts. First, let me reiterate the most important thing - I do not understand the physics...
There are no gravitons in General Relativity, and black holes don't evaporate in General Relativity (i.e. there is no Hawking radiation). The consequence of Hawking radiation, or something similar,...
My question. I have started reading (on my own) B.Hall, "Quantum Theory for Mathematicians (Graduate Texts in Mathematics, 267)", Springer, 2013. In the introduction section, the author says that...
In what should come as no surprise, you don't determine the number of normal modes by the number of $\cos$ subexpressions occurring in the solution. (I guess there's a sense where you could say tha...
Suppose we perform the double slit experiment , but we fire instead 2 electrons instead of 1. In the double slit experiment performed in the 1920s a interference pattern was observed at the screen...
Pretty much any system where the state of one thing effects the rate of another, and the state of that other thing effects the rate of the first. Surely you can think of a few of those. One examp...
The general formula for a EM wave (solving for the E field) is: where $\varepsilon = \varepsilon _{r}+j\frac{\sigma }{\omega }$ My professor told me that the conductivity of vacuum is 0 so we...
Suppose we have a arc of charges with some charge density $\lambda(\theta) = sin\theta$.I am using polar coordinates for convenience.But how can I find the direction of the unit vector of the net e...
No, you don't need the highest setting. Just stirring gently is enough, anything more won't help much. Salt dissolves very well in water. It dissolves so well, that an area of very salty water for...
No, the answer can be seen by inspection in a few seconds, and it's not 2.8667. We don't just give answers to homework problems here, so I'll only make a few comments on the problem and your attem...
My optician counselled me I don't recommend a 1.74 index with a metal grooved frame, like the one you want from ic! Berlin, because the edge will be less resilient and be more susceptible to chi...
As we have set up communities here on the Codidact network we've been appointing temporary moderators. Ultimately, of course, we want each community to choose its own moderators; we've been doing ...
We need marketing more than moderators There is so little activity here, even one person can easily handle the rare moderation tasks. If you just need to put a name in a slot, then I'm willing to...
This site is not for five year olds. We are not kindergarten teachers. Asking a bunch of volunteers on the internet to explain physics to a five year old is a waste of time. Explanations at that...
If we have a LC high pass filter the transfer function H(s) becomes: $$ H(s) = \cfrac{sL}{sL + \cfrac{1}{sC}} $$ If we solve for s to find a pole of the transfer function we get: $$ s = j \cfrac...
Get 2 conductors and seperate them we can use Gauss's law to calculate the capacitance created by the seperation of the 2 conductors.Can we use other laws of electromagnetism to calculate the induc...
The increase in tension from 15 N to 17 N happens because when you introduce masses and place them over a pulley, the dynamics of the system change. Without the pulley, forces directly oppose each ...
Can we use other laws of electromagnetism to calculate the inductance of a piece of wire just like we used Gauss's law to calculate the capacitance of the 2 seperated conductors? Yes. The inducta...
Practically (or engineeringly) speaking you'd need the surface temperature sensors; or experimentally determined fudge-factor values. Experimentally you might determine which window is most prone t...
