//find
clc
//solution
//given
W1=3//kN
//n1=0.1*n
W2=2//kN
//n2=0.2*n
W3=1//kN
//n3=0.3n
W4=0
//n4=0.4n
L95=20*10^6//rev
b=1.17
//x=L95/L90
x=[log(1/0.95)/log(1/0.90)]^(1/1.17)
L90=L95/x//rev
W={[(0.1*W1^3)+(0.2*W2^3)+(0.3*W3^3)+0]/[0.1+0.2+0.3+0.4]}^(1/3)
C=W*(L90/10^6)^(1/3)
printf("dynamic load rating is,%f kN",C)