Recent content by 69911e

Thanks for replies. I thought I was missing a simple solution to a simple problem, that seems not to be the case. I was looking for a solution to discuss with my kids over dinner. As the discussion is about the Physics not the math, I use the approximate solution of constant acceleration...

How to calculate time until charged particles (Electron/Positron for example) collide starting at velocity= 0 , distance x apart: Using coulombs law, how do I get the velocity and position equation for a pair of unit charged particles? A simple reference link would be great as I know this is...

MFB: It seems not too complex of an algorithm if limited to 2 equations. We may be able to use it and define the bounds needed. Thanks

MFB: Thanks for the link. I forgot to specify, coefficients (C1&C3) of x and y are also defined as co-prime. This is a small part of a (non-school) prime number related summer project I am working on with my 13&16 year old and we trying no to get bogged down on this equation. If it does not a...

I am trying to understand how to find solutions for a problem when parameters are limited to positive integers. Example: 30x+19= 7y+1 =a ; where x,y,a are positive integers Wolframalpha outputs: a = 210 n + 169, x = 7 n + 5, y = 30 n + 24, n element Z(integers) 30*7= 210 (obviously) How do I...

Is there an online simulator which can be used to visualize the double slit interference? I know this can be done via equations, but as I am working with my kids on this, I prefer visual and want to add variations of different polarizers before each slit. If no simulator available, any...

Can someone help me understand exactly what a0 is in the following paper (page9)? http://arxiv.org/pdf/1405.1283v1.pdf "where a0 ≡ be−∆/2 (60) is a fixed length that can only be determined by experiment." Found it in this article which has a better diagram...

I was pondering: Same starting point, same end point, same path, simultaneous within allowable uncertainty. Basically identical signals overlapping in all possible aspects.

Yes, that is why I mentioned likely bad question. How can this question be changed so the time and path of the 2 photons can be fully addressed?

How would 2 photons with the same starting point& time and same end point view each other's positions, time and distance from start to end point. I recognize this is likely a bad question, so any input would be helpful.

Jorrie: That clarifies what I was looking to understand. I also was not using scale factor term correctly. Thanks

I am wondering what the formula would be for the amount of Dark Energy in the observable universe would be for different time (t). (according to best current theory/data) Would it be this directly proportional to volume? Dark energy (t) = Dark energy (present time)/ (scale factor (t)3) If so...

Now I understand. The same units, with the same name for 2 associated but different things is what I missed. Now we get back to applying this... Thanks!

Is the lightcone graph on page1 consistent with: wa=0 and w0=-1?

http://www.scholarpedia.org/article/Cosmological_constraints_from_baryonic_acoustic_oscillation_measurements Sponsored by: Dr. Lydia Roos, CNRS/IN2P3/LPNHE, Paris, France Reviewed by: http://www.scholarpedia.org/article/User:Anze_Slosar Reviewed by...