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
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.
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.