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diff --git a/1325/CH13/EX13.5/13_5.PNG b/1325/CH13/EX13.5/13_5.PNG
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--- /dev/null
+++ b/1325/CH13/EX13.5/13_5.PNG
diff --git a/1325/CH13/EX13.5/13_5.sce b/1325/CH13/EX13.5/13_5.sce
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+//to find the stiffness of the governor spring
+clc
+//given
+w=3//lb
+W=15//lb
+g=32.2
+r2=2.5/12//ft
+N2=240//rpm
+w2=N*%pi/30
+F2=w*w2^2*r2/g
+a=4.5//in
+b=2//in
+sleevelift=0.5
+r1=r2*12+a*sleevelift/b//the increase of radius for a scleeve lift is 0.5 in
+N1=1.05*N2
+F1=(N1/N2)^2*(r1/(r2*12))*F2
+//a) at minimum radius
+S2=(F2*a/b-w)*2-W
+//b) At maximum radius
+DB=r1-r2*12
+BI=1.936//in
+AD=a
+BI=b
+S1=2*(F1*AD/BI-w*(DB+BI)/BI)-W
+k=(S1-S2)/sleevelift
+printf("Stiffness of the spring is %.1f lb/in",k)