var('mu B z m x v F a')
m=1.8e-25
B=1.4e3*z
mu=9.27e-24
x=3.5e-2
v=750
F=mu*diff(B,z)
a=F/m
d=function('d',z)
d=a*x**2/v**2
d

Krane-7-7.5 (last edited 2010-12-18 08:06:44 by SabareeshNikhil)