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diff --git a/Advanced_Strength_and_Applied_Elasticity/Chapter11.ipynb b/Advanced_Strength_and_Applied_Elasticity/Chapter11.ipynb
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+{
+ "metadata": {
+  "name": "",
+  "signature": "sha256:f729277270c4906babbae57b26d0a48c913109394e1fe2bf1cae355bbbb10bbd"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "Chapter11-Elastic Stability"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Ex1-pg319"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "import math\n",
+      "#calcualte weight and N\n",
+      "E=210*10**9. ##Pa\n",
+      "d=100. ##mm\n",
+      "t=50 ##mm\n",
+      "A=0.005\n",
+      "Iz=0.05*(0.1**3)/12.\n",
+      "print(Iz)\n",
+      "Iy=0.1*(0.05**3)/12\n",
+      "print(Iy)\n",
+      "##r=sqrt(Iy/A)\n",
+      "r= math.sqrt(Iy/A)\n",
+      "print(r)##mm\n",
+      "L=2.75\n",
+      "\n",
+      "##P=W/tand(15)=3.732\n",
+      "Pcr=(math.pi**2.*E*Iz)/L**2.\n",
+      "print'%s %.2f %s'%(\"into W is= \",Pcr,\"\")\n",
+      "W=Pcr/3.732\n",
+      "print'%s %.2f %s'%(\"in N is= \",W,\"\")\n",
+      "\n",
+      "Pcr=(math.pi**2*E*Iy)/L**2.\n",
+      "print'%s %.2f %s'%(\"into W is= \",Pcr,\"\")\n",
+      "W=Pcr/3.732\n",
+      "print'%s %.2f %s'%(\"in N is= \",W,\"\")\n",
+      "\n",
+      "## Ans varies due to round of error\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "4.16666666667e-06\n",
+        "1.04166666667e-06\n",
+        "0.0144337567297\n",
+        "into W is=  1141937.70 \n",
+        "in N is=  305985.45 \n",
+        "into W is=  285484.42 \n",
+        "in N is=  76496.36 \n"
+       ]
+      }
+     ],
+     "prompt_number": 1
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
+\ No newline at end of file