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+// Problem no 15.2,Page no.352
+
+clc;clear;
+close;
+
+D=0.8 //m //iameter of water main
+h=100 //m //Pressure head
+w=10*10**3 //N/m**3 //Weight of Water
+sigma_t=20*10**6 //MPa //Permissible stress
+
+//Calculation
+
+p=w*h //N/m**2 //Pressure of inside the main
+t=p*D*(2*sigma_t)**-1*100 //m //Thcikness of metal
+
+//Result
+printf("The Thickness of metal is %.2f",t);printf(" cm")