Hello Physics Forums,
In my project work, I've had to use the LMA technique for some non linear fitting. I really want to understand what it's doing rather than just using it. I have a poor knowledge of non linear fitting so please bear with me!
When producing the line of best fit, it...
Hello all,
In terms of Radio Astronomy, can someone please explain to me the difference between the Beam Width and the Angular Resolution? I have a 1.2m dish to play about with, and I wanted to know what it could resolve. I thought I was sorted by using the diffraction formula, but then I...
I think I just worked it out. Colour has nothing to do with a materials ability to absorb and hence emit thermal radiation. Colour is important in reflecting and absorbing wavelengths in the visible spectrum only. A white material will reflect all visible wavelengths, but a black surface would...
Homework Statement
Hello, I'm a little confused. I did an experiment today with a Leslie Cube. One of the faces was a black paint, and another a white paint. I know that white reflects well and has a low emissivity, at least in the visual wavelengths. In the Leslie's cube, was hot water, so...
Hello,
Can someone please briefly explain to me why, if I have a system (water) T1, and introduce it to a heat bath of temperature T2 (where T2>T1), and the are left to reach equilibrium, that the total entropy change does not depend on the mass of water?
Thank you.
Do I find (\Delta t) by doing SQRT[(4^2)-(3^2)] = ROOT 7
Then at they are both at the same coordinates in the inertial reference frame, we can ignore x , y and z. Therefor S equals the root of (c^2)*(ROOT 7) = 7.9x10^8m
Is this correct?
Homework Statement
Two events occur at the same place in an inertial reference fram S, but are separated in time by 3 seconds. In a different frame S', they are separated in time by 4 seconds.
(a) What is the distance between the two events as measured in S'?
(b) What is the speed of S...