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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...
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...
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...
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...
Yes, that would the obvious interpretation of that equation in one dimension. Note also that in that case, the divergence also reduces to the ordinary derivative. In other words, in one dimension,...
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...
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: $$ s = j \cfrac...
Can we use other laws of electromagnetism to calculate the inductance of a piece of wire just like we used Gauss's law to calculate the capacitance of the 2 seperated conductors? Yes. The inducta...
What examples of a system can be described by a system of ordinary differential equations?
Gravitational waves can be derived from the non-linear Einstein field equations and since they are by definition waves they must obey the wave equation: $u_{tt}=c^{2}u_{xx}$ but in General Rela...
Lets say we have a mass connected to a spring.Assuming not any friction the ODE which describes the system is $m\frac{d^{2}x}{dt^{2}} = -kx$ We can set 2 Dirichlet boundary conditions $x(0)=0$ an...
The incremental inductance depends on the natural log of the l/d ratio. It also is reduced by the gap of the return conductor but is not affected by the dielectric around it. https://www.mantaro.c...
I'm trying to understand the uncertainty principle and its implications for particle measurement. From what I've read, it seems that the principle states that we cannot simultaneously know the exac...
Maxwell's first law in differential form states that $$ \triangledown \cdot E = \frac{\rho}{\epsilon_{o}} $$ . In case of 1d can we say that $$\rho = \lambda$$ where $$\lambda$$ is the linear char...
Olin and Derek have covered the biggest part of this: the combination of energy and momentum conservation rules out the two-into-one combination of photons that are not co-linear. That might leave...
How to derive the Lagrangian differential force? $$\frac{d}{dt}(\frac{\partial L}{\partial \dot{x}})+\frac{\partial L}{\partial x}=0$$ I was trying to do something. $$L=T-U=\frac{1}{2} m\dot{x}^...
For an absolute beginner : If you don't have any idea of any theories than, I would suggest to study theories at first. Just practice beginner problems at first which contains no-calculus(It's OK ...
Force is perpendicular to the surface. And, green color "rod" is parallel to the surface. So, $$F = N - mg\cos \theta=0$$ Reference
The error was on mass. In question : $$m=20 \ g$$ And, I wrote following one in answer $$m=20\times 10^3 \ kg$$ which is completely wrong. Cause, $1 \ kg=1000 \ g$
While force is vector. So, we should use vector addition not "direct addition". From vector addition formula $$C=\sqrt{A^2+B^2+2ABcos\alpha}$$ For force, $$F=Eq$$ $$F=mg$$ $$F=\sqrt{(Eq)^2+(m...
I had flagged the post as off-topic. There was a comment automatically created (Post Feedback). When I visited the flag raised page. I noticed it's not available anymore. Seems like, if I choose ne...
A 4C point charge of mass 2kg is suspended by a string of length 6m. The charge is placed in the Earth's Gravitational field and a uniform horizontal electric field of strength $\sqrt{11}NC^{-2}$...
