-UltrafastPED
Thanks for that info. I'm starting to do Optics for my research and I'm slowly getting my feet wet. The "dogleg" setup will hugely help me. The idea is so simple, but effective. I don't know about cutting the lens in half, my adviser might kill me, but I'll give your other...
I hope this is the right place to ask this. It is an experiment question.
I have a 785 nm laser and a 1550 nm laser and I need to converge them down to a point. Now I could just manually align the lasers on the same XY-plane and have them hit that spot, but for reasons I don't want to...
I saw this post at stackexchange:
I ran across this post when trying to solve a homework problem. But I have no idea how he got that solution for that. When I use the Euler-Lagrange, I get this diff eq below.
Here is the simplest form I have managed to get it in...
^ Yeah sorry, that is what I meant.
That hint helped me thanks. It is like watching a magic trick. Once you know the trick, it becomes simple. Haha.
So do you have any tips in general on how to better this "intuition"...? Or is it just about gaining more confidence...?
Hey guys. I'm trying to gather some tips that people have acquired that helps them write the Lagrangian for a system. Obviously, the classic examples are drilled into our heads over and over, but just when you think you can tackle any problem the professor throws at you, there is that tricky one...
Ahh... That was my gap in my understanding. I don't know why I didn't see it that way from the beginning. With that in mind, I derived the right potential.
Thank you guys for helping! :smile:
Hmm... I see what you mean. Let me look into that in the morning. It is about 2:15 in the morning for me and I got to get some shut eye.
From a quick glance, I would argue that I never wrote down my forces in "x_2-x_1" terms, so I would not run into that. But I'm sleep deprived so I may not...
^ Yes you are right. I just typed it wrong when I was reading it off of Taylor. Thanks
For the integration, yes I made it really general and simplified, but it is right. I'm still integrating along the general x-axis since both variables, though they are named different, still vary in the...
First of all, my question isn't completely unrelated to a homework question. I know how to answer that question using definitions in the book and mechanically get to the end. But I wanted to start from basic principles and arrive at the same answer. This lead to a contradiction which sent me on...
Okay, after experimenting with your post, micromass, I found out it does work for any value you want to pick off. So I want to thank you for that. But I have to translate this into coding and it seems like it is going to be more code to write this than just my original idea to use an if and else...
-micromass
Yes, that seems to work. But really what I need is what chogg stated. I need to able to "mask out", as chogg perfectly put it, more than one element. Will that work for picking out more than one element..? Thanks for the help.
-chogg
Yes, that is exactly what I need to do. You see...
I have a small problem where I remember I learned it in the past. But now I can't seem to recall how to do it. I searched on google, but I think even though it is probably really easy, I may not have worded it right to get the references I want. So I decided to ask here.
Here is the problem...
Yep, that does it! :cool: Thanks so much! This is going to help me out a lot. I wish I could give you something. So here are some http://freeinternetcookies.com/" [Broken]. You have to click yes. :smile:
Well first of all, thank you for replying.
I followed your steps and it makes sense. I was a bit uneasy in understanding the normalizing parts, but I trusted you. (It is definitely because of my limited knowledge than yours. :shy:)
So I decided to use your end result and I solved for a using...
So here is a picture I quickly made in photoshop that has the problem:
[PLAIN]http://img21.imageshack.us/img21/9406/trigproblem.png [Broken]
The rectangle's dimensions are known. (w & h) So it follows that the angle, "@", and the diagonal, "d", is also known. The width between the two...
Okay, I see what we did wrong. So basically there would be no way to get length information with just pure geometry on a piece of paper... We are forced to use the derived formulas..? (L'=L*sqrt(1-v^2) , t'=...)
Thanks for everything. I'm probably going to post more throughout this semester...
:smile: I have already come across it in my Modern Physics last year.
And of course you are not becoming a bore. I think I see what you are talking about. The original L(0) that is shifted up in my figure in the x'-x'L ...? If that is the case, then you should know that the horizontal L(0)...
@Mentz and Jesse
I think I see where you guys are coming from. But the diagram that I posted may be misleading. The L(0) that touches the t' and t'L is just there to show the magnitude of L(0). Not that it shows any movement. The L' that touches x' and x'L axis is the one that from the x-t...
I'm doing some independent study with a professor at my university. He has taken one GR class and he said that it was not a good experience. So we are in a sense learning together as we pursue this.
We are using the book "A First Course in General Relativity" by Schultz. We are doing problem...
I'm sorry I should have said Hall voltage measurement. We will know the value of the B-field and will be solving for the sheet carrier density. Our magnet range is around .5-1.5 Tesla. Most of our work will probably be around .5-1 Tesla.
The outline we are following is here...
Me and a friend are working on a research project that involves four-point electrical measurements. (Van der pauw) To do a hall effect measurement, the sample and probes have to have a strong magnetic field pass through. So we want some design ideas on constructing the mount that will have to be...
^ Thanks for that. Sorry for the late reply. I was really busy this weekend.
I'll ask him about it today and will get back to you. I'm pretty sure he told me that he was doing X-Ray Fluorescence. I'm sure he knows about the basic laws of reflection. I think the question was more what angle is...
First of all, I'm not the one doing this experiment. I've just finished my first year in college and I'm sort of just helping all the upper-level with their research and whatnot. So my knowledge is very limited.
With that being said, one of those student is doing X-ray Fluorescence. He was...