Search results for query: *

Has anybody said coffee/Red Bull yet?

http://www.motorcycle-usa.com/2013/03/article/backmarker-breaking-down-the-bubba-scrub/ I know this may be old, but this also looks at some more physics behind the scrubbing. There seems to be a lot of physics going on in SuperCross, next you should look at the physics behind MotoGP Racers...

Physics is hard.

Yes, my understanding was that it was like a spectrometer but wasn't sure what the advantage was. I thought we were going to be looking at the diffraction grating, but you are correct. It's the Auger electrons we'll be looking at. I was looking more for a deeper understanding than conceptual on...

I'm supposed to be working with a CMA (Cylindrical Mirror Analyzer), but I'm more interested in the physics behind it. This is the instrument in question that we are looking to get: http://www.rbdinstruments.com/products/micro-cma.html We want it to look at different eV levels of different...

Interesting, I've never worked with a Lego Mindstorm, so each different color was able to be given a new function? And how did you account for turning? Did you slow down one of the motors? Or just turn it off? I always wanted to play around with a mindstorm when I was younger, but could never...

Yeah I found a really good one on there that really helped me out thanks! http://www.instructables.com/id/A-Simple-Arduino-Based-Line-Follower/

I'm looking to build an Arduino that is capable of following a line depending on a colored strip on the ground, either black or white. I think I might use a LDR, but not quite sure where to even start to be honest. My office is having an Arduino contest, and I just want the Arduino to carry...

Associate in Science at NSTec

Do you have a recommendation of any other mathematical methods books that would be a bit easier to comprehend? I feel myself getting lost in the jumps boas does from explaining the basic concepts to jumping straight to certain complex ideas with little explanation.

When you say sphere, do you mean a 3D sphere, or a 2D circle that lives on a plane. You can define the sphere itself as a plane, and in calc 3 you learn that you can define shapes and do "pull backs" or "push forwards" in which you can stretch an object/shape/line and make it one to one to a...

Is there any alternative books that teach you how to just do the problems rather than emphasizing why, and is there any books that emphasize why in an easier format? Something like a "mathematical methods for dummies" book? This is the book I'm referring to (...

I believe that with the use of Green's theorem and some other integration techniques, you will need to look at techniques from Calc 3 and at least gone through Calc 1 and Calc 2. I know you posted this long time ago, but perhaps a member reading this will have the same question. Cheers!

I think you are thinking of it in reverse. You need things like linear algebra, planes, lines, etc. to define geometric shapes, not the other way around. Have you taken a multivariable course? Or have you heard of the idea of domains and sets of values living in a "neighborhood" of another...

Oh okay, this clarified it for me, redid the problem and got it correctly, thank you! :woot:

So just take the volume integral with the density formula and that will account for the change in density. But why is there no jacobian if we are changing coordinate systems we must account for this somehow...

so triple integral from the bounds being the same as if i was finding half a sphere (obviously) times the Jacobian integrated with the density function in terms of spherical coordinates. That would be this equations ∫∫FoΦ(u,v)||Tu,Tv||dudv as this part ∫∫FoΦ(u,v)(((((||Tu,Tv||)))))dudv is the...

How does this question differ from when they ask for the mass of a spherical shell. Because I can do the shell fine, but I just don't know how it jumps to volume... or when the object is full.

Okay, I know to use spherical coordinates. I just am not sure which integral to use. That is my confusion.

^^^^

Yes, I know, there was a typo before, but the typo is no longer there, I already switched to spherical coordinates, hence the equation that I am using since I am perimeterizing.

That was a typ-o from copying and pasting, I am still stuck on what to do...

doesnt answer my question though.

Oops it's supposed to be x^2+y^2+z^2=/< 4, so it would be best to convert to spherical coordinates.

What I did in the previous problem was parameterize the surface, but that was asking for mass of shell, now it is mass of ball. So am I supposed to use volume then divide by the density? ? ?

Tu stands for Φ(u,v) derivative with respect to u and Tv is Φ(u,v) with respect to v.

Homework Statement If the density of the half-ball x ^2 + y ^2 + z ^2 ≤ 4 ; z ≥ 0 is given by δ(x, y, z) = ( x^ 2 + y^ 2 + z ^2)^(1/2) find its mass. Homework Equations ∫∫F⋅ds ∫∫FoΦ(u,v)||Tu,Tv||dudv ∫∫FoΦ(u,v)⋅(Tu,Tv)dudv The Attempt at a Solution For the last problem I was asked to find...

Right. So the purpose is to have the probability of the whole function sum up to 1. Okay. I went to office hours and got things clarified thank you!

But seems to be that open source allows for the users to sometimes find these errors before running the program or may be able to fix it. So it does solve somethings, but open source can then be more buggy depending on the support from the company right?

So when A is (2/L)^3/2 then |\psi|^2 is equal to one since the probability density must go to one? So to solve for A one would just go through |\psi|^2 = 1 then solve for A?

For time independent Schrodinger's equation in 3-D Where Enx,ny,nz=(nx/Lx2+ny/Ly2+nz/Lz2)(π2ħ2/2m and Ψnx,ny,nz=Asin(nxπx/Lx)sin(nyπy/Ly)sin(nzπz/Lz) How do I normalize A to get (2/L)^3/2? I don't think I understand how to normalize constants.

Yeah! Because I already forgot my suggestions! :doh:

Funny how we remember the rigor of the courses, but as time goes on they don't seem as bad as they once were. :oldeyes:

Did teachers have anything to do it during your high school years or even your college years?

As long as it keeps you going and you now enjoy what you're studying, then why not? :oldbiggrin:

Sounds like some similar responses that I've received from other EE/Robotics majors I've talked to. Seems better then the "I just want to make money" responses.

When I was younger in high school, quantum and my physics teacher is what did it for me. Now what does it for me is when I learn an interesting fact that I can actually apply to real world scenarios.

What inspired you to choose the major you are currently doing/did. Was there a certain topic that excited you as a child that lead you to do what you did in school? Perhaps you read about particle-wave duality, and that was enough to spark your interest, or quantum mechanics, or cell division or...

never mind, I just kept doing the unit vector wrong. Simple arithmetic mistake.

Having a melt down as I have done this problem twice now and my exam is tomorrow and I can't seem to figure it out anymore... ugh. 1. Homework Statement The depth of a lake at the point on the surface with coordinates (x, y ) is given by D(x, y ) = 100−4x 2 −y 2 . a) If a boat at the point...

Did the OP just want the difference in drag, but not take into account the actual difference in hp and torque the Harley and YZF have? Also like another person said, whether or not you have a fairing is going to make a world of difference. Some Harley Sportser flat trackers are made to be pretty...

I would start by looking at the AP Chemistry books since that seems to be the extent to which you are going to have to teach. There are many AP Chem resources and if you wanted a book you could go to the book resources in the forum. Perhaps if you are in a time crunch, looking at an AP...

When I said it was easy, I meant that it was very arbitrary, like the problems that are shown in Khan Academy, did you also not see my other comments? I said to do the homework later on. Khan Academy helped me through Calc 1 Calc 2 on understanding things conceptually, not the problems. BUT...

How do you find a normal vector of a function at a point, such as f(x,y)= ax^y+yx^y^x+b at (X_o,Y_o) where a and b are just arbitrary constants, and the function is an arbitrary function. So I guess, what is the general steps you take to find the normal? I thought it had to do with the...

Also, if you are taking something over the summer (ten weeks or under) then I recommend doing or at least attempting all the homework the day it is assigned that way it mauls over in your brain over the next couple of days. Calculus online is very easy, at least the one offered for the UC...

If you are a college student, then taking calc 1 over the summer isn't a bad idea if you want to graduate on time. Use khan academy and go through every video, and mathstockexchange for any questions you might have or thsese forums. Just need to be very disciplined.

For part number 5, it says to make sure that each ΔT is positive. Why is this? Couldn't it be a negative? Or does it have to be positive since if it wasn't you would be getting heat going in the wrong direction? Like the one substance would be gaining instead of losing the heat? Which would...

Using the Maxwell-Boltzmann equation above, there is an example in my book (Giancoli 4th edition p. 481) where they use this to find the average velocity. I understand that it would just be the sum of all the speeds of the molecules divided by the number of molecules. But then I'm having...

You actually just need very little calculus, but you can instead think of it as the limit approaching to zero rather than the derivative and that should help you.

It is important to remember that the "constant" of 9.8m/s^2 only applies when you are near the surface of the earth, and that the farther away you are from earth, the weaker the gravity's pull as you can see from the equation: F=G(m_1m_2)/r^2 Where G is the actual universal gravity constant...