Recent content by zalnas

Perfect, thank you! That is exactly the explanation I was looking for. I was specifically wondering why antimatter didn't take precedence in the formation of the universe; I understand that it would not survive in the current state of the universe.

I've recently learned more about antimatter, namely what types there are, and one question has stuck in my mind: why are atoms not composed of Positrons and Antiprotons? Since scientists at the LHC recently were able to contain antihydrogen, it seems that these atoms, while isolated from matter...

Yes I do. Thanks for your help.

Damn. That makes sense now that I think about.

I tried Krot,f = F*d where d is the distance the center of mass moves, but I got the incorrect answer, and it was my last try. Oh well, I must've used a wrong number. Thanks for your help though!

Ah, I'm not sure why I solved for the period. I got the correct answer, thank you very much!

Thanks for the reply. I tried setting the two equal: .5*7*.272 d\omega/dt = .27*45 Which yielded 47.62 m/s. However, that isn't the correct answer.

I've got the same assignment due tonight. For the first part, you can set Kinetic Energy equal to the work done on the disk, W=Fd. d is the distance the center of the disk moves. From there, just solve for v, so: Fd = .5*m*v2 Were you able to get the second one?

Homework Statement A uniform-density 7 kg disk of radius 0.27 m is mounted on a nearly frictionless axle. Initially it is not spinning. A string is wrapped tightly around the disk, and you pull on the string with a constant force of 45 N through a distance of 0.9 m. Now what is the angular...