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I have recently heard of Apsidal Vectors. I was searching about it through internet. I had found the video in YT. I had found similar question in PF. But, the PF answer wasn't clear to me. I am jus...
Laplacian acts like Divergence but not completely. If you take a function (called $\vec{A}$) and write that laplacian of that function is $0$ than it will be flat space. $$\nabla^2\vec{A}=0$$ But...
I was looking for equation of motion. I came up with a solution but it doesn't satisfy me. Cause I was trying to find motion of that particle using Lagrangian. We know that $$W=\int \vec F\cdot d\...
Which one is correct? $$E=mc^2$$ or $$E^2=(mc^2)^2+(pc)^2$$ I mostly seen $$E=mc^2$$ from my childhood, and when I was learning problem solving in relativistic mechanics I had seen $$E^2=(mc^2)^2...
Is it the correct time to have a moderator? It's already a year we have the Physics community. But it's really inactive. There's only 42 question in Q&A which proves that we still don't have l...
I saw following equation in Griffiths EM $$V(r)=-\int_\mathcal{O}^r \vec E \cdot d\vec l$$ While the surface was closed but not symmetrical circular. At first I was thinking $\mathcal O$ was repr...
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 $\sqrt{11}NC^{-2}$...
Would a colony on earth's moon need to be deeply underground to ensure more natural gravity (by getting closer to its core)?
I haven't studied to much. I don't have any idea of Physics. Last few moments, I was just passing my time by reading theories. I have little bit idea of inflationary theory. If you think of a ...
Suppose we have an electric dipole of charge Q+ and Q-.The charges of the dipole are fixed (they cant move closer to each other than they already are).If we place a test particle at some distance r...
I had a thought that crossed my mind a while back that went something like this: It's a cool thing measurements exist, if there wasn't, there'd be trouble and we'd be counting atoms if we could....
Mass of a timber is $20 \ g$. And, density of that timber is $0.27 \ g/cc$. That timber was bind to a metallic materials and, it was released to $0.970 \ g/cc$ water. How much the wood was submer...
"Which xxx is best?" are poor questions for this Q&A site. When "best" can't be quantified, all you really get is a popularity contest. Another problem is when the available choices change ov...
But, when we are walking, running. We are accelerating. Wrong.When you are walking you're moving at a costant speed. The third law says we will never find a particle accelerating unless the...
Mass M1 is held on a plane with inclination angle θ, and mass M2 hangs over the side. The two masses are connected by a massless string which runs over a massless pulley (see Fig. 3.1). The c...
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. This is incorrect Answering the re...
Since, there's no book category currently so, I am asking it here. And, It can be moved to that category later. I want to start learning now so, I don't want to wait. Which book is best for Clas...
Please see the images below. I owned these Mykita John glasses for three years, which feels short for glasses to break! Every day, I fold them them before placing it on my night stand and going to ...
Let w be the price of water that I'll use to dilute. Forget that. Unless you are in extraordinary circumstances, the price of water is so low compared to the vinegar as to be irrelevant. How do ...
