Hello there,
I've just been learning about surface magnetization currents circulating around hypothetical square loops. Since the magnetization is uniform the circulation currents cancel where the square loops are adjacent to one another and it can therefore be said that the current circulates...
Hi Mark,
Thanks for having a look at this again for me. Your response has put my mind at rest and gives me the confidence to carry on through the text without worrying too much about verifying every detail. I did manage to complete the integral on the left hand side, using integration by...
Hi Mark,
Thanks for getting back to me. Yes, m(r) is the mass of gas contained within a cloud of radius r. I don't believe the text actually states whether the mass increases in a linear fashion. The notation in this new module I'm doing is throwing quite a bit. I recently got a distinction...
Hello there,
I'm reading a section of my textbook that is deriving the virial theorm from the hydrostatic equilibrium equation. In part of the derivation it states that
$$-\int_0^M\frac{Gm(r)}{r}dm(r)=E_{GR}=-\frac{GmM}{r}$$
When I perform this integral I get the wrong answer. Here's my...
Hello there,
I was wondering if someone might be able to help me out with some intermediate steps please. I can't see how
$$f_{tt} =-\int_{r_0}^0 \left(\frac{2Gm_0}{r} - \frac{2Gm_0}{r_0}\right)^{-\frac{1}{2}} dr$$
becomes
$$f_{tt} =-...
Hello there,
I'm starting S382 astrophysics with the OU. The course book says "The proton-proton chain converts four hydrogen nuclei (protons) into a ^4_2He nucleus, two positrons that quickly collide with electrons and are annihilated, and two neutrinos. Hence, branch I of the p-p chain may be...
Hello everyone,
I've been studying for a Natural Sciences degree (physics pathway) with the Open University for around three and a half years now. I'm two thirds of the way through and just have four level three, thirty credit modules to complete. I've loved every minute of it so far (well...