Recent content by rstein66

Thanks Vela, that made a lot of sense. I'll give it another go.

Problem: In the circuit shown in the figure below, the capacitors C1 and C2 have a capacitance of 45µF. C3 and C4 have a capacitance of 90µF. The two terminals A and B on the left have a potential difference of 25V (Sorry - had to quickly draw it, could not save/find image) (a) Find the...

Homework Statement Hey, if anyone could help with this question I am very stuck on (not homework) I would really appreciate it. A group of astronomers make observations of the Pandora cluster of galaxies spanning 600 arcseconds in the sky. X-Ray astronomers found it to have a λmax of...

Ok, disregard my previous post, I think I got it. If anyone could verify my answers and such I would really appreciate it. 1. z=(λshift,hydrogen - λrest,hydrogen)/λrest, hydrogen z=27.3cm-21cm/21cm , z= 0.3 v=Ho*d, d=v/Ho where v is the recession velocity which is equal to c*z...

ah so for 1. z=0.3 v=Ho*d, thus d=v/Ho, where v=cz so 3e5km/s(0.3)/70km/s/MPC = 1286Mpc Then for 2, using the formula: 2.5e5"(r/d)=theta(in arcsec) r=1286e6pc(600") / 2.5e5" = 3.09Mpc Did I do this correctly, I edited because I used a wrong formula Continuing with this data i plugged in the...

Homework Statement Hi, I am having difficulties with a first-year astronomy question that was issued on a final a few years back. A group of astronomers make various observations of a cluster spanning 10arcmin (600arcsec) on the sky. X-ray astronomers found the cluster to be full of hot gas...