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{
"metadata": {
"name": "",
"signature": "sha256:6d28037b4c9a453240f29bc629f78e4da0796902d617a06cee6c7af7af12458e"
},
"nbformat": 3,
"nbformat_minor": 0,
"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"chapter3-Work energy and heat first law of thermodynamics"
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 3 - Pg 25"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"import math\n",
"##calculate the work interaction of spring\n",
"##initialisation of variables\n",
"m= 5 ##kg\n",
"g= 9.8 ##m/sec^2\n",
"k= 500 ##N/m\n",
"##CALCULATIONS\n",
"x= m*g/k\n",
"W= -m*g*x\n",
"##RESULTS\n",
"print'%s %.2f %s'% ('work interaction of spring = ',W,'J')\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"work interaction of spring = -4.80 J\n"
]
}
],
"prompt_number": 2
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 4 pg 27"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"import math\n",
"##calculate the work done by the gas\n",
"##initialisation of variables\n",
"m= 500 ##kg\n",
"V= 50 ##L\n",
"P= 700 ##kPa\n",
"T= 25 ##C\n",
"P0= 100 ##kPa\n",
"g= 9.8 ##m/sec^2\n",
"A= 200 ##cm^2\n",
"V1= 100 ##L\n",
"##CALCULATIONS\n",
"pe= P0*math.pow(10,3)+(m*g/(A*(math.pow(10,-4))))\n",
"W= pe*(V1-V)*(math.pow(10,-6))\n",
"##RESULTS\n",
"print'%s %.2f %s'% ('work of the gas =',W,'kJ')"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"work of the gas = 17.25 kJ\n"
]
}
],
"prompt_number": 3
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 5 pg 32"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"import math\n",
"##calcualte the energy change in process 1,2,3 and work in third process\n",
"##initialisation of variables\n",
"W= 5 ##kJ\n",
"Q= 23 ##kJ\n",
"Q1= -50 ##kJ\n",
"W1= 0 ##kJ\n",
"##CALCULATIONS\n",
"E1= Q-W\n",
"E2= Q1-W1\n",
"E3= -(E1+E2)\n",
"W3= -E3\n",
"##RESULTS\n",
"print '%s %.f %s'%('energy change in process 1 =',E1,'kJ')\n",
"print'%s %.f %s'% ('energy change in process 2 = ',E2,'kJ')\n",
"print '%s %.f %s'%('energy change in process 3 = ',E3,'kJ')\n",
"print '%s %.f %s'%('Work in third process = ',W3,'kJ')\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"energy change in process 1 = 18 kJ\n",
"energy change in process 2 = -50 kJ\n",
"energy change in process 3 = 32 kJ\n",
"Work in third process = -32 kJ\n"
]
}
],
"prompt_number": 4
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 6 pg 34"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"import math\n",
"##calculat the car mileage of given variable\n",
"##initialisation of variables\n",
"V= 12 ##km/L\n",
"##CALCULATIONS\n",
"MPG= V*3.7854/1.609\n",
"##RESULTS\n",
"print'%s %.2f %s'%('car mileage =',MPG,'MPG')\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"car mileage = 28.23 MPG\n"
]
}
],
"prompt_number": 5
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 7 pg 35"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"import math\n",
"##find whether salesman is honest or not\n",
"##initialisation of variables\n",
"p= 800 ##atm\n",
"P= 10000 ##psi\n",
"x= 14.696 ##psi/atm\n",
"##CALCULATIONS\n",
"P1= p*x\n",
"##RESULTS\n",
"if (P1>P):\n",
"\tprint (\"Salesman is honest\")\n",
"\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Salesman is honest\n"
]
}
],
"prompt_number": 6
}
],
"metadata": {}
}
]
}
|
