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+{
+ "metadata": {
+  "name": "",
+  "signature": "sha256:1e2ea72063f4480e1666d90f5821f69263d6f609957c096a14e46eb50fe68a8d"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "Chapter 21:Motion of Rotation"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 21.1, Page no.447"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#variable declaration\n",
+      "omega_0=0     #initial angular velocity\n",
+      "alpha=0.5     #angular acceleration in rad/sec**2\n",
+      "t=10          #time in sec\n",
+      "\n",
+      "#calculation\n",
+      "omega=omega_0+alpha*t\n",
+      "theta=omega_0*t+(alpha*t**2/2)\n",
+      "\n",
+      "#Result\n",
+      "print\"Angular velocity of the flywheel, omega=\",int(omega),\"rad/sec\"\n",
+      "print\"Angular displacement of the flywheel, theta=\",int(theta),\"rad\""
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Angular velocity of the flywheel, omega= 5 rad/sec\n",
+        "Angular displacement of the flywheel, theta= 25 rad\n"
+       ]
+      }
+     ],
+     "prompt_number": 1
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 21.4, Page no.448"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "import math\n",
+      "#variable declaration\n",
+      "omega_0=0     #initial angular velocity\n",
+      "alpha=0.5     #acceleration in rad/sec**2\n",
+      "t_1=120       #timetaken in sec\n",
+      "omega1_0=60   #initial angular velocity when pulley is coming to rest in rad/sec\n",
+      "alpha_2=-0.3  #Retardation in rad/sec**2\n",
+      "\n",
+      "\n",
+      "#calculation\n",
+      "#To calculate angular speed of pully in r.p.m. at the end of 2 min.\n",
+      "omega=round((omega_0+alpha*t_1)/(2*math.pi),2)\n",
+      "#To calculate time in which the pulley will come to rest\n",
+      "t_2=-omega1_0/alpha_2\n",
+      "\n",
+      "#Result\n",
+      "print\"Angular speed of pully in r.p.m. at the end of 2 min., omega=\",int(omega*60),\"r.p.m.\"\n",
+      "print\"Time in which the pulley will come to rest, t_2=\",int(t_2),\"sec\"\n",
+      "\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Angular speed of pully in r.p.m. at the end of 2 min., omega= 573 r.p.m.\n",
+        "Time in which the pulley will come to rest, t_2= 200 sec\n"
+       ]
+      }
+     ],
+     "prompt_number": 2
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 21.9, Page no.453"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#variable declaration\n",
+      "r=0.6      #radius of wheel in m\n",
+      "omega_0=0  #initial angular velocity\n",
+      "alpha=0.8  #angular acceleration in rad/s**2\n",
+      "t=5        #time in s\n",
+      "\n",
+      "#calculation\n",
+      "omega=omega_0+alpha*t\n",
+      "v=r*omega\n",
+      "\n",
+      "#result\n",
+      "print\"Linear velocity of the point on the periphery of the wheel, v=\",round(v,1),\"m/s\"\n",
+      "\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Linear velocity of the point on the periphery of the wheel, v= 2.4 m/s\n"
+       ]
+      }
+     ],
+     "prompt_number": 3
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 21.10, Page no.453"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "import math\n",
+      "#variable declaration\n",
+      "r=1    #Radius if pulley in m\n",
+      "N=240  #angular frequency in r.p.m\n",
+      "\n",
+      "#calculation\n",
+      "omega=2*math.pi*N/60\n",
+      "v=r*omega\n",
+      "\n",
+      "#Result\n",
+      "print\"Linear velocity of the particle on the periphery of the wheel, v=\",round(v,1),\"m/s\"\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Linear velocity of the particle on the periphery of the wheel, v= 25.1 m/s\n"
+       ]
+      }
+     ],
+     "prompt_number": 4
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [],
+     "language": "python",
+     "metadata": {},
+     "outputs": []
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
+\ No newline at end of file