Recent content by relativitydude

I was going for in only for terms of x, to disclude y Is it valid how you subsituted the original x and y, but not the differentiated ones?

Hello, I'm trying to really understand orbits. I want to be able to calculate the velocity at any given point in an orbit. Now, parametrically an ellipse can be: x = a*cos(t) y = b*sin(t) If those are position, can I take the derivative to obtain velocity? x' = -a*sin(t) y' =...

Thanks for all the help. I guess not having an overall angle made the problem, well, impossible. Including it brought me quickly to the answer.

Yes, using the horizontal and vertical components would be really easy but I only know the overall magnitude :(

Overall Magnitude = sqrt( (mag1*cos(A) + mag2*cos(B) + mag3*cos(C))^2 + (mag1*sin(A) + mag2*sin(B) + mag3*sin(C))^2) I don't think it's that easy since the angle and magnitude go hand in hand. I need to solve for both mag1 and angle A. I'm sorry if I forgot to really point that out. I...

Most of the time, one uses vectors to find an overall magnitude acting on something, but I need to go in reverse. Say I know there are a slew of charges and the center one feels a force of some magnitude and there is one undefined vector (magnitude and angle unknown) I would think if you know...

I have found some syllabi but they only give assigned problems. I am having a hard time doing a self-study. It's hard to remain on task with no guidance and so much material. Any suggestions from those who do this often?

I don't know how to proceed on this question. It says: A shift of one fringe in the michelson-morley experiment would result from a difference of one wavelength or a change of one period of vibration in the round trip travel of light when the inferometer is rotated 90º What speed would...

I'm going to be self-studying Tipler's modern physics over the summer. I just got the third edition for $7.71 off eBay and it's in pristine condition :) I am trying to find a detailed syllabus instead of me reading every page and doing every problem.

Are the "Feynman Lectures on Physics" books good? Are the "Feynman Lectures on Physics" books good? I'm going into my junior year next year and wonder if these books are any good to study over the summer?

What is a tensor and why is it useful?

This is a tricky one, sin(3x)cos(x)=sin(x)cos(x)(3-sin^2(x)) I have tried addition formulas and expanding sin(3x) into something else, any help?

**Bump** I guess there is no such thing

Where to take "Introductory Modern Physics" online? I missed taking "introductory modern physics" this semester and need it for my junior classes. Does anyone know of an institution that has an online class for it? Or I would even study it independently and take a test on it. Help!

Is "Modern Physics" course hard? Is "Modern Physics" course hard? It's a 3 Credit course that deals with special relativity, atomic structure etc. Would it be impossible to study for this on my own to test out of it?