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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 ...
At home daily, I need to mix my table salt + COLD tap water. As "Marine salts dissolve faster and more thoroughly when added to circulating water," I "use a powerhead to speed up mixing time — my V...
We commonly say that something has a weight, which is synonymous with a mass. Things have a weight because the force of gravity is relative to something’s mass. Subatomically, what is mass? There ...
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 ...
Are there areas in the observable universe which surely cannot contain galaxies with planets that can support life as we know them?
Is it plausible to desire a "universal" calendar applicable everywhere in our universe? Must calendars be based on solar systems (Must calendars be "relational")? It might be that the universe "...
I was looking for book on classical thermodynamics. I found lot of related posts in PSE but couldn't find a book which type I was expecting. I was searching for book which covers the whole thermody...
In short, momentum is vector and kinetic energy is scalar. $$\vec p = m \vec v \tag{1}$$ $$T = \frac{1}{2}m \vec v^2=\frac{\vec p }{2m} \tag{2}$$ Two momenta in opposite direction is $0$. Total ...
How can I turn this floor lamp into a reading light? I want all light exiting upwards from the lamp shade to point down. Do I just buy a mirror and put it on top of the lamp shade? Then the mirror...
I don't understand either of these Reddit comments that are still too complicated. Please simplify? Alfenhose An interesting phenomena, it is because the brain doesn't store what you saw during ...
