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diff --git a/sample_notebooks/MohdAsif/Chapter5.ipynb b/sample_notebooks/MohdAsif/Chapter5.ipynb
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+{
+ "metadata": {
+  "name": "",
+  "signature": "sha256:abf9f7aa50395283288e62f0f85bd91bae92b4155380f5c281c2602a3861ceb7"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "Chapter - 5 Wave Motion and speed"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 1, page : 115"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "from __future__ import division\n",
+      "from math import pi\n",
+      "#frequency\n",
+      "r=3  #m\n",
+      "w=10  #s**-1\n",
+      "vs=r*w  #m/s\n",
+      "A=6  #m\n",
+      "fd=5/pi  #s**-1\n",
+      "vmax=A*2*pi*fd  #m/s\n",
+      "v=330  #m/s\n",
+      "n=340  #Hz\n",
+      "nmax=((v+vmax)/(v-vs))*n  #Hz\n",
+      "nmin=((v-vmax)/(v+vs))*n  #Hz\n",
+      "print \"Maximum frequency is \",nmax,\" Hz\"\n",
+      "print \"Minimum frequency is \",nmin,\" Hz\""
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Maximum frequency is  442.0  Hz\n",
+        "Minimum frequency is  255.0  Hz\n"
+       ]
+      }
+     ],
+     "prompt_number": 2
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 2, page : 118"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "from __future__ import division\n",
+      "# frequency\n",
+      "#given data :\n",
+      "N=400  #hZ\n",
+      "V=340  #M/S\n",
+      "VS=60  #M/S\n",
+      "N2=((V/(V-VS))*N)  #Hz\n",
+      "print \"Frequency when engine is approaching to the listner is \",round(N2,2),\" Hz\"\n",
+      "N3=((V/(V+VS))*N)  #Hz\n",
+      "print \"Frequency when engine is moving away from the listner is \",round(N3,2),\" Hz\""
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Frequency when engine is approaching to the listner is  485.71  Hz\n",
+        "Frequency when engine is moving away from the listner is  340.0  Hz\n"
+       ]
+      }
+     ],
+     "prompt_number": 3
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 3, page : 120"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "from __future__ import division\n",
+      "#frequency\n",
+      "v=1200  #km/h\n",
+      "w=40  #km/h\n",
+      "vs=40  #km/h\n",
+      "n=580  #Hz\n",
+      "nd=((v+vs)/((v+vs)-vs))*n  #Hz\n",
+      "print \"Frequency of the whistle as heared by an observer on the hill is \",round(nd,2),\" Hz\"\n",
+      "x=29/30  #km\n",
+      "x*=1000  #m\n",
+      "print \"Distance is \",round(x,2),\" m\"\n",
+      "ndd=((v-w)+vs)/((v-w))*nd  #Hz\n",
+      "print \"Frequency heared by driver is \",round(nd,2),\" Hz\""
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Frequency of the whistle as heared by an observer on the hill is  599.33  Hz\n",
+        "Distance is  966.67  m\n",
+        "Frequency heared by driver is  599.33  Hz\n"
+       ]
+      }
+     ],
+     "prompt_number": 7
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 5, page :125"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "from __future__ import division\n",
+      "#frequency\n",
+      "v=340  #m/s\n",
+      "n=600  #Hz\n",
+      "vs=36  #km h**-1\n",
+      "vs1=vs*(1000/3600)  #m/s\n",
+      "apf=((v)/(v-vs1))*n  #Hz\n",
+      "vs2=54  #km h**-1\n",
+      "vs3=vs2*(1000/3600)  #m/s\n",
+      "apf1=((v)/(v+vs3))*n  #Hz\n",
+      "print \"Two apparent frequencies are \",round(apf,2),\" Hz and \",round(apf1,2),\" Hz\"\n",
+      "df=apf-apf1  #Hz\n",
+      "print \"Difference in frequencies is \",round(df,2),\" Hz\""
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Two apparent frequencies are  618.18  Hz and  574.65  Hz\n",
+        "Difference in frequencies is  43.53  Hz\n"
+       ]
+      }
+     ],
+     "prompt_number": 12
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 9, page : 135"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "from __future__ import division\n",
+      "from math import sqrt, pi\n",
+      "#foce constant,displacement , acceleration and energy\n",
+      "x1=.10  # in m\n",
+      "F1=4  # in N\n",
+      "K=F1/x1  \n",
+      "x2=0.12  # in m\n",
+      "print \"(a) The force constant, K = \",K,\" N/m \"\n",
+      "F=-K*x2  \n",
+      "print \"(b) The force, F = \",F, \" N\"\n",
+      "m=1.6  # in kg\n",
+      "T=2*pi*sqrt(m/K)  \n",
+      "print \"(c) Period of pscillation, T = \",round(T,2), \" s\"\n",
+      "A=x2  \n",
+      "print \"(d) Amplitude of motion,A = \",A, \" m\"\n",
+      "alfa=A*K/m  \n",
+      "print \"(e) Maximum acceleration,alfa = \",alfa,\" m/s**2\"\n",
+      "x=A/2  # in m\n",
+      "w=sqrt(K/m)  \n",
+      "v=w*sqrt(A**2-x**2)  \n",
+      "a=w**2*x  # in m/s**2\n",
+      "KE=(1/2)*m*v**2  # in J\n",
+      "PE=(1/2)*K*x**2  # in J\n",
+      "TE=KE+PE  \n",
+      "print \"\"\"(f) velocity is %0.2f m/s\n",
+      "acceleration %0.2f  m/s**2\n",
+      "Kinetic energy is %0.2f J\n",
+      "Potential energy is %0.2f J\"\"\" %(v,a,KE,PE)\n",
+      "print \"(g) Total energy of the oscillating system %0.2f J\" %TE"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "(a) The force constant, K =  40.0  N/m \n",
+        "(b) The force, F =  -4.8  N\n",
+        "(c) Period of pscillation, T =  1.26  s\n",
+        "(d) Amplitude of motion,A =  0.12  m\n",
+        "(e) Maximum acceleration,alfa =  3.0  m/s**2\n",
+        "(f) velocity is 0.52 m/s\n",
+        "acceleration 1.50  m/s**2\n",
+        "Kinetic energy is 0.22 J\n",
+        "Potential energy is 0.07 J\n",
+        "(g) Total energy of the oscillating system 0.29 J\n"
+       ]
+      }
+     ],
+     "prompt_number": 22
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
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