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 one year ago
in simple harmonic motion why does omega squared equal k/m? where does this come from?
 one year ago
in simple harmonic motion why does omega squared equal k/m? where does this come from?

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John_ES
 one year ago
Best ResponseYou've already chosen the best response.1This comes from the differential eqution of the harmonic motion. The model for a spring, with mass m and elastic constant k, says, \[m\cdot a=k x\Rightarrow m\frac{d^2x}{dt^2}+kx=0\Rightarrow \frac{d^2x}{dt^2}+\frac{k}{m}x=0\Rightarrow \frac{d^2x}{dt^2}+\omega^2x=0\] Using the last substitution is easy to find the solution \[x=A\cos(\omega t+\phi)\]

Affaan
 one year ago
Best ResponseYou've already chosen the best response.0i dont understand polarization of x rays plz help me

Affaan
 one year ago
Best ResponseYou've already chosen the best response.0i want notes on fermi dirac statistics

John_ES
 one year ago
Best ResponseYou've already chosen the best response.1You can find some interesting notes about Fermi Dirac statistics in the web. For example, http://solar.njit.edu/~leej/lecture/ph641/Ch04_summary.pdf However, I also reommend you the Volume 5 of Berkeley Physics Course (introductory level) and the book from Kittel "Elementary Statistical Physics", Part1, Chapter 19. Other books of higher level (Hwang, Pathria) should be usefull too.

John_ES
 one year ago
Best ResponseYou've already chosen the best response.1For Xray polarization you can check the following links, http://skullsinthestars.com/2009/06/06/barklashowsthatxrayshavepolarization1905/ http://www.nist.gov/pml/div684/grp01/xraypolarization.cfm http://wwwconf.slac.stanford.edu/xray_polar/XRay%20presentations/Fabian.pdf
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