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+// Problem no 9.1,Page no.232
+
+clc;clear;
+close;
+
+D=15 //cm //External Diameter
+t=2 //cm //Thickness
+L=6 //m //Length of cyclinder
+E=80*10**9 //Pa
+alpha=1*1600**-1 
+sigma_c=550*10**6 //Pa //compressive stress
+
+//Calculations
+
+d=D-2*t //m //Internal Diameter
+A=%pi*4**-1*(D**2-d**2)*10**-4 //m**2 //Areaof Tube
+I=%pi*64**-1*(D**4-d**4)*10**-4 //m**4 //M.I of tube
+k=(I*A**-1)**0.5 //m //Radius of Gyration
+
+P_e=%pi**2*E*I*(L**2)**-1 //Euler's Load
+P_R=sigma_c*A*(1+alpha*(L*k**-1)**2)**-1 //According to Rankine's Formula
+
+//The Answer in Textbook is incorrect for P_R 
+
+//Now again from Rankine's Formula
+//As K=I*A**-1,so substituting in below equation
+//Thus Stress calculated from Euler's Formula cannot exceed the yield stress of 550 MPa
+L=(%pi**2*E*k**2*(550*10**6)**-1)**0.5*10**-2 //m //Length of cyclinder
+
+//Result
+printf("The Length of strut is %.2f",L);printf(" cm")