Looking for an equation and creator of it.

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The discussion revolves around identifying an equation related to the periodic oscillation of star brightness, likely linked to Cepheid variables. The user is searching for the astrophysicist behind this equation, mentioning a possible Russian background and connections to Jewish heritage. Henrietta Swan Leavitt is suggested as a key figure in this area, known for her work on Cepheid variables. The conversation also touches on solar flares and other related equations. Overall, the focus is on uncovering the scientist's identity and contributions to astrophysics.
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Homework Statement



i've heard of this equation from somewhere ...

equation for periodic oscillation of brightness of stars.


would like to know this astrophysics's name to see what else he's done

Homework Equations



none

The Attempt at a Solution




he's also seen one of brightest solar flares or some periodic change or something...

also made another equation for reflection on the sky or something...

he's in Canada somewhere, Russian and something about might be Jewish background...
 
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"periodic oscillation of brightness of stars."

Sounds like Cepheid variables. A Wiki search turns up the name of Henrietta Swan Leavitt?
 
Last edited:
http://arxiv.org/PS_cache/astro-ph/pdf/0608/0608622v1.pdf
 
Last edited by a moderator:
hmm thx... any idea on which scientist/ physicist though?
 
Thread 'Variable mass system : water sprayed into a moving container'

Thread 'Variable mass system : water sprayed into a moving container'

Starting with the mass considerations #m(t)# is mass of water #M_{c}# mass of container and #M(t)# mass of total system $$M(t) = M_{C} + m(t)$$ $$\Rightarrow \frac{dM(t)}{dt} = \frac{dm(t)}{dt}$$ $$P_i = Mv + u \, dm$$ $$P_f = (M + dm)(v + dv)$$ $$\Delta P = M \, dv + (v - u) \, dm$$ $$F = \frac{dP}{dt} = M \frac{dv}{dt} + (v - u) \frac{dm}{dt}$$ $$F = u \frac{dm}{dt} = \rho A u^2$$ from conservation of momentum , the cannon recoils with the same force which it applies. $$\quad \frac{dm}{dt}...
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