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{
"metadata": {
"name": ""
},
"nbformat": 3,
"nbformat_minor": 0,
"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"Chapter 2 - Work"
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 1 - Pg 16"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#Calculate the net work done\n",
"#Initialization of variables\n",
"from numpy import math\n",
"g=1.4 #Gamma\n",
"P=100. #psia\n",
"V1=3. #cu ft\n",
"Pf=20. #psia\n",
"#calculations\n",
"V2=V1*math.pow((P/Pf),(1/g))\n",
"W=(Pf*V2-P*V1)*144./(1-g)\n",
"#results\n",
"print '%s %d %s' %(\"Net work done =\",W,\"ft lb\")\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Net work done = 39810 ft lb\n"
]
}
],
"prompt_number": 1
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 2 - Pg 17"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#Calculate the net work done\n",
"#Initialization of variables\n",
"Wb=-33000. #ft-lb\n",
"V2=3. #cu ft\n",
"V1=1. #cu ft\n",
"P=69.4 #psia\n",
"#calculations\n",
"Wa=P*(V2-V1)*144.\n",
"W=Wa+Wb\n",
"#results\n",
"print '%s %d %s' %(\"Net work done =\",W,\"ft-lb\")\n",
"print '%s' %(\"The answer is a bit different due to rounding off error in textbook\")\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Net work done = -13012 ft-lb\n",
"The answer is a bit different due to rounding off error in textbook\n"
]
}
],
"prompt_number": 3
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 3 - Pg 20"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#Calculate the net work done\n",
"import math\n",
"#Initialization of variables\n",
"b=11. #in\n",
"s=15. #in\n",
"l=2.4 #in\n",
"k=80. #psi per in\n",
"#calculations\n",
"a=math.pi*b*b /4\n",
"L=s/12.\n",
"Pm=1.6/l *k\n",
"W=Pm*a*L\n",
"#results\n",
"print '%s %d %s' %(\"Net work done =\",W,\"ft lb\")\n",
"print '%s' %(\"The answer is a bit different due to rounding off error in textbook\")\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Net work done = 6335 ft lb\n",
"The answer is a bit different due to rounding off error in textbook\n"
]
}
],
"prompt_number": 4
}
],
"metadata": {}
}
]
}
|
