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diff --git a/Mechanics_of_Materials_by_James_M._Gere/chapter9.ipynb b/Mechanics_of_Materials_by_James_M._Gere/chapter9.ipynb
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+{
+ "metadata": {
+  "name": "",
+  "signature": "sha256:688a5ddb04d5076a46d59fbb5d6dc8d907dec2ec735786354cef92d935d1ccd0"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "Chapter 9: Deflections of beams"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 9.17, Page number 654"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "\n",
+      "\n",
+      "#Variable declaration\n",
+      "P = 5           #load(k)\n",
+      "L = 8*12        #beam length(in)\n",
+      "E = 30*10**6    #modulus of elasticity(psi)\n",
+      "I = 75.0        #moment of inertia(in^4)\n",
+      "q = 1.5*(1./12.)#load intensity(k/in)\n",
+      "\n",
+      "#Calculations\n",
+      "Sc = ((P*L**3)/(48*E*I))+((5.*q*L**4)/(384.*E*I))\n",
+      "\n",
+      "#Result\n",
+      "print \"The download deflection is\",Sc,\"in(Calculation mistake in textbook)\"\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "The download deflection is 0.0001024 in(Calculation mistake in textbook)\n"
+       ]
+      }
+     ],
+     "prompt_number": 8
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 9.23, Page number 682"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "\n",
+      "#Variable declaration\n",
+      "E = 30*10**6*144   #modulus of elasticity(lb/ft^2)\n",
+      "I = 25.92/12       #moment of inertia(ft^4)\n",
+      "x = 12             #ft\n",
+      "\n",
+      "#Calculations\n",
+      "'''The equivalent load q(x) for the beam is given by the following equation\n",
+      "q(x) = -700(x)^-1+800(x-6)^0 - 800(x-12)^0 - 5600(x-12)^-1 + 1500(x-16)^-1\n",
+      "Since the equation equals zero at all points except where x=16, we omit the last term\n",
+      "Taking 4th order integration, we obtain the following expression,'''\n",
+      "C1 = (-((350*x**3)/3)+((100*(x-6)**4)/3)-((100*(x-12)**4)/3)+((2800*(x-12)**3)/3))/12\n",
+      "print \"C1 =\",C1\n",
+      "\n",
+      "#For Deflection at point C\n",
+      "x = 6\n",
+      "Elv = ((350*x**3)/3)-(100*((x-6)**4)/3)+(100*((x-12)**4)/3)+(2800*((x-12)**3)/3)+(C1*x)\n",
+      "Sc = Elv/(E*I)    #ft\n",
+      "\n",
+      "#For deflection at point D\n",
+      "x = 16\n",
+      "Elv_16 = ((350*x**3)/3)-(100*((x-6)**4)/3)+(100*((x-12)**4)/3)+(2800*((x-12)**3)/3)+(C1*x)\n",
+      "Sd = Elv_16/(E*I)\n",
+      "\n",
+      "#Results\n",
+      "print \"Deflection at point C is\",round((-Sc*12),8),\"in\"\n",
+      "print \"Deflection at point D is\",round((Sd*12),8),\"in\"\n",
+      "\n",
+      "print \"\\n Please note that there is a calculation mistake in textbook while calculating Elv. Hence, the difference in solution\"\n",
+      "\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "C1 = -13200\n",
+        "Deflection at point C is 0.00027315 in\n",
+        "Deflection at point D is 2.06e-06 in\n",
+        "\n",
+        " Please note that there is a calculation mistake in textbook while calculating Elv. Hence, the difference in solution\n"
+       ]
+      }
+     ],
+     "prompt_number": 19
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
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