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+{
+ "metadata": {
+  "name": "",
+  "signature": "sha256:62ceb66cf48441d19499a6332c57808da0a2f8834a586c75e2d7d1a835c045df"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "Chapter 9 : Impact of Jets"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 9.1 Page No : 171"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "import math \n",
+      "\n",
+      "#initialisation of variables\n",
+      "d= 2. \t    #in\n",
+      "V= 210. \t#ft/sec\n",
+      "V1= 50. \t#ft/sec\n",
+      "g= 32.2 \t#ft/sec**2\n",
+      "w= 62.4 \t#lb/ft**3\n",
+      "\n",
+      "#CALCULATIONS\n",
+      "M= math.pi*V*w/(4*36*g)\n",
+      "F= M*V\n",
+      "dV= V-V1\n",
+      "M1= math.pi*dV*w/(4*36*g)\n",
+      "F1= M1*dV\n",
+      "W= F1*V1\n",
+      "F2= M*dV\n",
+      "W1= F2*V1\n",
+      "\n",
+      "#RESULTS\n",
+      "print  'Force on plate = %.f lb'%(F+1)\n",
+      "print  ' Force on plate = %.f lb'%(F1)\n",
+      "print  ' Work done/sec = %.f ft-lb/sec'%(W)\n",
+      "print  ' Force on plate = %.f lb'%(F2)\n",
+      "print  ' Work done/sec = %.f ft-lb/sec'%(round(W1,-3))\n",
+      "\n",
+      "#The answer is a bit different due to rounding off error in textbook\n",
+      "\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Force on plate = 1865 lb\n",
+        " Force on plate = 1082 lb\n",
+        " Work done/sec = 54116 ft-lb/sec\n",
+        " Force on plate = 1421 lb\n",
+        " Work done/sec = 71000 ft-lb/sec\n"
+       ]
+      }
+     ],
+     "prompt_number": 1
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 9.2 Page No : 172"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "\n",
+      "import math \n",
+      "\n",
+      "#initialisation of variables\n",
+      "v1= 15. \t#ft/sec\n",
+      "v2= 40. \t#ft/sec\n",
+      "a= 30.  \t#degrees\n",
+      "b= 150. \t#degrees\n",
+      "v= 15.27 \t#ft/sec\n",
+      "g= 32.2 \t#ft/sec**2\n",
+      "\n",
+      "#CALCULATIONS\n",
+      "a1= a-math.degrees(math.sin(v1*math.sin(math.radians(b))/v2))\n",
+      "w= math.cos(math.radians(a1))*v2\n",
+      "vr= v2*math.sin(math.radians(a1))/math.sin(math.radians(a))\n",
+      "v1= math.sqrt(v1**2+vr**2-2*v1*vr*math.cos(math.radians(a)))\n",
+      "r= 180-math.sin(math.radians(a))*vr/v\n",
+      "w1= v*math.cos(math.radians(r))\n",
+      "W= v1*(w-w1)/g\n",
+      "\n",
+      "#RESULTS\n",
+      "print  'a = %.2f degrees'%(a1)\n",
+      "print  ' w = %.2f ft/sec'%(w)\n",
+      "print  ' vr = %.2f ft/sec'%(vr)\n",
+      "print  ' v1 = %.2f ft/sec'%(v1)\n",
+      "print  ' w = %.2f ft/sec'%(w)\n",
+      "print  ' Work done per pound = %.2f ft-lb/lb'%(W)\n",
+      "\n",
+      "# Note : Answers are different because of rounding off error."
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "a = 19.32 degrees\n",
+        " w = 37.75 ft/sec\n",
+        " vr = 26.47 ft/sec\n",
+        " v1 = 15.42 ft/sec\n",
+        " w = 37.75 ft/sec\n",
+        " Work done per pound = 25.39 ft-lb/lb\n"
+       ]
+      }
+     ],
+     "prompt_number": 2
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 9.3 Page No : 173"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "\n",
+      "import math \n",
+      "\n",
+      "#initialisation of variables\n",
+      "d= 0.5    \t#in\n",
+      "a= 165. \t#degrees\n",
+      "W= 7.35 \t#lb\n",
+      "W1= 500. \t#lb\n",
+      "t= 148. \t#sec\n",
+      "g= 32.2 \t#ft/sec**2\n",
+      "w= 62.3 \t#lb/ft**3\n",
+      "\n",
+      "#CALCULATIONS\n",
+      "Q= W1/(t*w)\n",
+      "v= Q*16*144/math.pi\n",
+      "dv= v*(1-math.cos(math.radians(a)))\n",
+      "F= dv*W1/(t*g)\n",
+      "r= W/F\n",
+      "k= (1-(W*t*g/(W1*v)))/math.cos(math.radians(a))\n",
+      "\n",
+      "#RESULTS\n",
+      "print  'k = %.3f '%(k)\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "k = 0.788 \n"
+       ]
+      }
+     ],
+     "prompt_number": 13
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 9.4 Page No : 174"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "import math \n",
+      "\n",
+      "#initialisation of variables\n",
+      "t= 0.25 \t#in\n",
+      "a= 30.   \t#degrees\n",
+      "w= 480. \t#lb/ft**3\n",
+      "h= 2.    \t#in\n",
+      "d= 0.5  \t#in\n",
+      "l= 6.    \t#in\n",
+      "w1= 62.4 \t#lb/ft**3\n",
+      "g= 32.2 \t#ft/sec**2\n",
+      "\n",
+      "#CALCULATIONS\n",
+      "W= t*l**2*w/1728\n",
+      "M= w1*math.pi*d**2*math.cos(math.radians(a))/(g*4*144)\n",
+      "v= math.sqrt(W*(l/2)*math.sin(math.radians(a))/(M*2*(1./math.cos(math.radians(a)))))\n",
+      "\n",
+      "#RESULTS\n",
+      "print  'Velocity of jet = %.1f ft/sec'%(v)\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Velocity of jet = 26.6 ft/sec\n"
+       ]
+      }
+     ],
+     "prompt_number": 18
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 9.5 Page No : 176"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "import math \n",
+      "\n",
+      "#initialisation of variables\n",
+      "V= 90. \t#ft/sec\n",
+      "a= 30. \t#degrees\n",
+      "u= 45. \t#ft/sec\n",
+      "\n",
+      "#CALCULATIONS\n",
+      "w= V*math.cos(math.radians(a))\n",
+      "f= math.sqrt(V**2-w**2)\n",
+      "tanb= (math.atan(math.radians(f/(w-u))))\n",
+      "b = math.degrees(math.tan(tanb))\n",
+      "b = math.degrees(math.atan(b))\n",
+      "V1= math.sqrt(f**2+(u-f*1./math.tan(math.radians(b)))**2)\n",
+      "\n",
+      "#RESULTS\n",
+      "print \"B = %.2f degrees\"%b\n",
+      "print  'absolute velocity of water at the exit = %.1f ft/sec'%(V1)\n",
+      "\n",
+      "# rounding off error"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "B = 53.79 degrees\n",
+        "absolute velocity of water at the exit = 46.6 ft/sec\n"
+       ]
+      }
+     ],
+     "prompt_number": 2
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 9.6 Page No : 177"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "import math \n",
+      "\n",
+      "#initialisation of variables\n",
+      "u= 734. \t#ft/sec\n",
+      "v= 2000. \t#ft/sec\n",
+      "g= 32.2 \t#ft/sec**2\n",
+      "da= 0.019 \t#kg/m**3\n",
+      "\n",
+      "#CALCULATIONS\n",
+      "W= g*v/(v-u)\n",
+      "A= W/(u*da)\n",
+      "\n",
+      "#RESULTS\n",
+      "print  'Weight of the air = %.1f lb/sec'%(W)\n",
+      "print  ' Area of inlet = %.2f ft**2'%(A)\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Weight of the air = 50.9 lb/sec\n",
+        " Area of inlet = 3.65 ft**2\n"
+       ]
+      }
+     ],
+     "prompt_number": 23
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
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