Recent content by fizixx

These are good too: http://www.cplusplus.com/" "[URL Function X[/URL]

vids Don't know of any myself. I have posted here looking for help with tensors as well, but have never really gotten a lot of support with it. To be honest with you I can't even say I have run across any really good, basic and clearly-explained texts on tensor math. I have several books, but...

Agreed 'loop"...and if you nav to the home page it is filled with java errors that make looking frustrating and counterproductive.

Hello folks, During my education I was not exposed to tensor notation much at all. Therefore I never developed an understanding for it. I spend some time on my own now, but often find it quite obtuse and lacking some of the detail I feel I need to reach that point of comfort. Does anyone...

Thanks for the suggestions so far, but I am clueless about this right now. I really don't know how to approach this...and still trust the results. I realize a number of things about this...that the focal point will be smeared out due to abberations in the lens, and I realize that it is the IR...

Hello all... This problem occurred to me the other day, so I decided to see if I could work it out, but am stuck. How much heat can be generated (in therory) using an ordinary magnifying glass to focus the sun's rays on a sunny day? Here's what I'm working with: A decent approximation for...

Thanks Doc, and everyone...yes, you're right, and I don't know why I couldn't get past that, but it finally clicked that that is what's going on. Classic case of making something harder than it has to be. I arrived at a reasonable answer of C =2.52 uF I appreciate the help! :)

Thank you for the thought, but here's wehre I'm seeing a dead end: From V = IR ==> V = I(X_c) (sorry everyone, I don't know hnow to use the nice looking math-type and fonts.) I'm assuming this is what you are alluding to. Then since X_c = 1/(2(pi)fC) ==> V = I/(2(pi)fC) -then- C =...

That's where I'm stuck I guess... Do you mean V/I = X_c? ==> 25V/0.23 A = X_c ?? And then put in for what X_c is and use it to find "C"?? This doesn't make sense to me if this is your implication.

Oh I see...ok...thanks for clarifying that a bit. The cap reactance is: X_c = 1/[2(pi)fC] f = freq = 580 Hz C = (capacitance) unknown for either cap.

It is not known. This is all the information I have for this. At first I thought it a fairly straightforward problem using reactance somehow, and the rules for caps in parallel, but I seem to quickly run into dead-ends. I have inquired about additional info, or 'missing' info, but am assured the...

Hello all, I have a capacitor problem that I can't seem to get a handle on. Maybe someone out there has some ideas. Ok...you have an AC source. It provides 25V (rms) with frequency of 580 Hz. There is a capacitor connected across its terminals. When a second cap. is connected in parallel to...

Hello everyone... I mistakenly posted this question in a math section, met with insufficient answers. :frown: My fault there, but here's the gist: How do you find the surface area of an n-dimensional sphere? I ran across this concept in a stat-mech class a long, long time...

saltydog...and others... Great in concept, but it does not answer my question, unfortunately. I think I asked my question on the wrong board. Providing an aswer that tritely says to just integrate your way up the dimension-ladder despite isn't sufficient, but I do apreciate the responses a...

I was kind of hoping someone could explain the derivation to me. I'm not sure if the link to mathworld is the solution or not. Even if it is I don't understand that any better without some kind of explanation. I'm 99.999% sure the other response is not going in the right direction, but I...