Forum: Ask the Experts

I'm posting a couple of hours early but thought I would wish the math geeks a happy one. http://news.yahoo.com/s/ap/20090303/ap_on_fe_st/odd_square_root_day

Engineer people (this means you, Fire Ant) get in here! I know you know Series! There hasn't been a single (successful) engineer in the history of modern engineering that doesn't know series well! So, here goes... I am certain I utterly failed an exam over differential equations. I got screwed on the series solution part. Now, I can do easy ones, like the one I will show in a second, but the hard ones, with unknown functions of variable coefficients? LOST. Okay, here is what I CAN do.

http://www.youtube.com/profile_play_list?user=khanacademy For those that care, this guy does this in his spare time... for free.

Honest to freakin god I'm about to go nuts here. Its the simple things that make us crazy, I really think so. Ok, issue. I am trying to copy a news article that is a pdf file. I can copy and paste with no problem, but I have not been able to quickly convert the column format to paragraph style. Once, somehow, I did it- it seems I "selected all" text and then chose "clear format" and that did the trick. However today all it clears is the font formatting. The only way I can clear the column formatting is to open it up to see the source or whatever and then individually, for each and every line, remove the code. Isn't there an easier way? I'm sitting here with notepad, wordpad, and Word open. The article is from a pdf. <pulls hair out>

I am the newest of the new web page builders, so new I still use Trellian and although there is an option to code it manually, I have very little idea how to do that, but that isn't even my problem. Currently I have just a page of various news links and links to other sorts of things, such as this forum, my forum, good astrological resources, ancient Sumerian and other writings, ect... so I plan to add other sections. What I want to do is also make a page that has an almost daily news roundup, kind of like a blog. Quite basically all the stories I post on my board each day (or almost each day) I'll make into one post with summaries of each story and links to source or whatever. So this page, if I can get it right, will become the index page, my links page will become another page that links off from it. I know how to build a page with links to other pages, but what I want to know is, when I go in and update each time, what do I do with the page from the previous day? I want to keep them around for...

I need to change the two dimensional time-independent Schrödinger Equation from Cartesian coordinates to Polar Coordinates. Then, if any of you know how to do it, I need help solving it using the separation of variables technique (the Partial Differential Equation seperatio of variables technique, not the Ordinary Differential Equation seperation of variables technique). Here is the equation: (∂^2Ψ(x,y)/∂x^2) + (∂^2Ψ(x,y)/∂y^2) = -k^2 Ψ(x,y) where k^2 is a constant, dependent upon energy and mass, and Ψ(x,y) is a function of x and y. Now, here is what I tried to do. If you know how, tell me if and where I made mistakes.

If anyone is good at ecnomics (I wish Perfectionist was still here), I have a question. In what ways has the Iraq war contributed to the devaluing of the USD? There is obviously a corelation, so what's the connection? I am looking for a slightly technical response if possible (i.e., not just political ranting against Bush. This is an acedemic interest on my part).

real or not? ive heard some self hypnosis stuff i dont think its the same

While I love history I never really studied much about the USSR or Canada . So I had some questions: USSR: 1. Does anyone have a map of before it was the USSR? During and after it stopped being the USSR (today)? 2. I am curious mostly to what it was before it became the USSR. Who owned what places (what countries existed)? 3. During the time when it was the USSR what countries existed at that point in europe? 4. What led to the USSR? What made it stop?

http://news.sky.com/skynews/picture_gallery/picture_gallery/0,,70141-1273172-11,00.html Can anyone identify this type of gun? Our police usually use the MP5 but this looks a bit different!

Ok I’m looking for some practical information here. What I want to do is produce enough electrical power to trickle charge a normal lead acid battery, (car battery) directly from a normal camp fire. On a very low budget! In order to achieve this I am looking at connecting a whole lot of thermocouples together into a thermopile. Use the camp fire to heat the one end and some water that is handy to cool the other. I was thinking along the lines of ceramics in a metal. casing to insulate the hot end. But the problem is finding a cheep source for the materials. I have found that normal welding wire as in arc welders is a good substitute for the nickel wire. But I need to find a good substitute for the Selenium or Tellurium wire. After all the last thing I want is to set up a pile of over 2000 wires.

I've been thinking about something for a while now and I thought that the science buffs here may be able to shed a little light on the matter, The current theroy is that the universe started off with the big bang. That means that all the matter that makes up this universe was all at some point in time concentrated in a single location. What would have been the strength of the gravitational pull of all that matter in a single consitrated location. By my logic there should have been enough gravatational force present to constitute a black hole. The universe should have consumed itself then and there, it should not have been able to expand outward no mater how big the bang was. What do you figure?

I was just wondering what the mayan calender is all about? Also why do people think in 2012 the end of the world will happen the calender just ends it doesnt say the end of the world or does it?

What the hell is EMS memory, and is it possible to add some to your computer? Thanks

I have always wanted to see the future and i was wondering, Could i be Cryo-frozen and one day be awaken. Now I know i dont have the resources but I think we all have thought about this once or twice. To my knowledge the act of being flash frozen would make the water in your cell rupture and kill you but is there any other theories out there?

I'am sick right now ..i have a cold..soo i was thinking..how do u get a cold in the first place..and what does it dooo???!! how does it work??? got eney ideas????

I was wondering about the science of second hand smoke? What is the real research about the effect on nonsmokers?

seriously, do they even have an AO account? If they do, do they even go on it?

I want to know the steps to taking a nuclear power plant offline. He saw it, he responded to it without answering the question. So I rephrased the question with more detail and now it's just gone. You can see by the date stamp that I asked what happened to my question yesterday and was ignored. The other posts in the forum are dated after mine. So, by reasonable deduction I have determined that my question was perhaps not in his area of expertise. (I don't know what his area of expertise is, it might be helpful to know.) So good luck with your forum, I hope other questions dont warrant more than a breezy answer.

If you are a psychologist, I need you to make me feel better. I just got a 60 on my Calculus quiz, and I have a feeling my test tomorro is going to be as bad... If you know Calculus, can you either point me to a good calculus 1 tutoring site (and trigonometry while yer at it!)... OR... Can you explain how to find the following: The first problem is this: