## Search found 289 matches

Fri Aug 24, 2007 8:53 pm UTC
Forum: Mathematics
Topic: What level of mathematics do people know on this forum?
Replies: 63
Views: 9431
Ap tests allow me to graduate a semester early, saving me thousands of dollars so hurrah for those. Anyway, I am a physics and math major. Im going to be a junior this year and so far I have taken all the calculus courses my school offers, linear algebra, differential equations, and complex analysis...
Fri Aug 24, 2007 8:36 pm UTC
Forum: Science
Topic: Gravity in the earth.
Replies: 29
Views: 5497
any reason why you say its wrong? I cant see a mistake.

edit: oops forgot the density part in the final answer.
Fri Aug 24, 2007 8:34 pm UTC
Forum: Science
Topic: +20 db what??
Replies: 23
Views: 4525
fear not, for they are still full of shit. I used to work at a fiber optics plant, and although some of the stuff they say technically makes sense (sort of), they still use the phrase "three SPECTRUMS of light", and then list off a bunch of wavelengths like they know what theyre talking ab...
Wed Aug 22, 2007 12:23 am UTC
Forum: Science
Topic: Gravity in the earth.
Replies: 29
Views: 5497
some have said it basically, but heres the math if you are at the center of the earth, the entire earth is like a spherical shell that you are in, so the net force is 0. if you move r meters in any radial direction, the spherical mass beneath you is equal to 4/3*pi*r^3*density of the earth. Force of...
Wed Aug 22, 2007 12:15 am UTC
Forum: Science
Topic: My noob relativity problems
Replies: 28
Views: 4197
1.Without getting into the math, here is my easiest explanation of why there is time dilation and spatial contraction: C is constant in all inertial reference frames. Since the speed of light is a velocity, or length/time, in order for this ratio to stay the same ie the speed of light stay the same,...
Sun Aug 12, 2007 7:37 pm UTC
Forum: Science
Topic: Lightning and Magnatism
Replies: 6
Views: 2439
the lightning we see is the result of a flow of current, not the actually current itself. We see lightning because the current splits air molecules, which then reform, releasing energy. While the air molecules are split, they are plasma. it is at this moment that you could repel said ions, but you c...
Sun Aug 12, 2007 7:28 pm UTC
Forum: Mathematics
Topic: Teach yourself economics!
Replies: 24
Views: 7247
not sure on any specific books, but Id look for books on econometrics rather than economics. My understanding is that econometrics is the quantitative approach to economics, while economics uses numbers but they dont really mean anything. For example, youll have a supply and demand graph, but the ac...
Sun Aug 12, 2007 7:17 pm UTC
Forum: Mathematics
Topic: Tom Lehrer Appriciation Society
Replies: 20
Views: 3699
I love him. I was introduced last year to him by my friends father who burnt a cd of his for all of his daughters friends. I figured since it was so old it wouldnt be funny, but the man is a genius and his humor transcends time. Glad to see other people have heard of him, because everyone Ive asked ...
Sat Aug 04, 2007 8:33 pm UTC