Recent content by Kamakiri

Right. That’s why even if I see easy problems that are marked hard, I don’t mind. Not yet. Can you point me in the right direction please?

I mentioned that problem in my first post to clarify what I meant by work. I was just emphasizing that I wasn’t referring to the work in physics. I’m not looking for specific work problems, just for very hard ones. Sadly, I don’t have an example. A few days ago, I googled “difficult work...

Those problems were so easy. By the way, it’s okay if the problem involves differential equations or other branches of math.

Yes. It’s okay if the problem isn’t purely algebraic as long as it’s very hard. I found a problem that involved probability and work, but it was a bit vague, so I neglected it. It’s not for a test. I’m interested in real-world problems. More importantly, I want very hard problems since I’ll...

I referred to 2 algebra books. I found easy problems only.

Yes, can’t find any.

For fear that I was vague, I’m looking for very hard problems. The problem I gave was so easy.

Do you have very hard problems about work? I referred to my algebra book and googled in vain. Not talking about the product of the force magnitude and the displacement magnitude. This is what I’m talking about – Jennifer takes 4 hours to do a job. John takes 6 hours to do the same job. Working...

The per-unit parameters are the same whether or not I multiplied the data by 1.076 or 1.0762.

Homework Statement Data from the short-circuit test of a 60-Hz, 100-kVA, 4600–230-V transformer are: VSC = 172.3 V ISC = 20.2 A PSC = 1046 W Get the per-unit parameters. 2. Relevant equations ISC ≠ Irated, so how will I solve the problem? The problem is from the book with ISBN 0130612103.

I read about Balmer lines. The H-alpha spectral line of hydrogen gas is red, since the energy of the photons emitted correspond to 656.3 nm, as E = hc/λ. Is that right?

Homework Statement In the spectrum of the blue part in a candle flame, there’s a violet emission at 432 nm due to excited CH* molecules (chemiluminescence). Why 432? Why not 400 or 500? There are emissions at 436, 475 and 520 nm too. Why these numbers? 2. The attempt at a solution Is it...