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+//developed in windows XP operating system 32bit
+//platform Scilab 5.4.1
+clc;clear;
+//example 11.2w
+//calculation of the distance from the earth's surface where resultant gravitational field due to the earth and the moon is zero
+
+//given data
+Me=6*10^24//mass(in kg) of the earth
+Mm=7.4*10^22//mass(in kg) of the moon
+d=4*10^5*10^3//distance(in m) between the earth and the moon 
+
+//calculation
+//gravitational field due to the earth at that point
+//E1 = G*Me/x^2.........................(1)
+//gravitational field due to the moon at that point
+//E2 = G*Mm/(d-x)^2.....................(2)
+//E1 = E2.....given 
+x=(d*sqrt(Me/Mm))/(1+sqrt(Me/Mm))
+
+printf('the distance from the earth surface where resultant gravitational field due to the earth and the moon is zero is %3.1e km',x*10^-3)