
#1
May1612, 01:28 PM

P: 2

halo, I´m stuck in an definite integral...
P(v)=4π (M2πRT)3/2⋅v2⋅e−Mv2nRT (maxwell speed distribution) How can I calculate the fraction of Ar in mars? pd. I got already the scape velocity But... How can I intregrate and evaluate between (0, 5XE3 m/s) or (5XE3 m/s, infinite) ?? Is there any tables for evaluate this?? thanks 



#2
May1712, 02:19 AM

P: 937

You can at least find tabulated values for the error function, erf(x) = _{0}∫^{x} dx' exp(x'^2). It might be easier just to plug in the numbers and integrate numerically, for example by using wolfram alpha.




#3
May1712, 06:25 PM

P: 2

thanks...
I calculated in Origin 8.5 (five minutes) trapezoids area... 50 000 intervals... It work as well and "rough" solution, good for giving a fast solution. 


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