Recent content by patcho

Yeh, int by parts needs two functions so you have ln(x) and 1. Make u=ln(x) and dv=1, then follow whozums equation and you'll get what TD wrote! +c of course

I think the question is just wanting you to say that the ptolemaic model used epicycles/deferrents as BobG said to explain that Mars is sometimes brighter when in opposition than other times and that in the Copernican model, the fact that the Mars orbit is an ellipse means it is closer to Earth...

Hi, I'm not quite sure about this question: 'How many Ways can 6 distinguishable molecules be placed in 3 different energy levels with 3 molecules in the 1st level, 2 in the 2nd level and 1 in the 3rd level, ignoring energy required?' If it was just how many ways to place them in 3...

Thanks HallsofIvy! It makes complete sense now, your derivation of kepler 3 really helps. Yeh, I got the slope as 3/2 so I knew I was doing something right :smile:

Hi, just wondering if anyone could help me with this. With a plot of log(T) against log(a) where 'T' is the period of satellite and 'a' the distance, I'm not sure what the y-intercept represents, something to do with the constant (4pi^2/GMm) I think, but not sure, any ideas? Also, the...