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

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John_ES Group TitleBest ResponseYou've already chosen the best response.1
This 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 \[x=A\cos(\omega t+\phi)\]
 one year ago

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

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

John_ES Group TitleBest ResponseYou've already chosen the best response.1
You 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.
 one year ago

John_ES Group TitleBest ResponseYou've already chosen the best response.1
For 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
 one year ago
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