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diff --git a/Engineering_Mechanics_by_Khurmi_R.S./chapter11.ipynb b/Engineering_Mechanics_by_Khurmi_R.S./chapter11.ipynb new file mode 100644 index 00000000..25b07c59 --- /dev/null +++ b/Engineering_Mechanics_by_Khurmi_R.S./chapter11.ipynb @@ -0,0 +1,872 @@ +{
+ "metadata": {
+ "name": "",
+ "signature": "sha256:184281d9efd5e0a993226e7e376baf4131b3afd17d002bdb4997678ec13c9170"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+ {
+ "cells": [
+ {
+ "cell_type": "heading",
+ "level": 1,
+ "metadata": {},
+ "source": [
+ "Chapter 11:Simple Lifting Machines"
+ ]
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example 11.1, Page no.187"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#variable declaration\n",
+ "D=300.0 #Diameter of wheel in mm\n",
+ "d=30.0 #Diameter of axle in mm\n",
+ "W=900.0 #Load in N\n",
+ "P=100.0 #Effort applied in N\n",
+ "\n",
+ "#calculation\n",
+ "VR=D/d\n",
+ "MA=W/P\n",
+ "Eta=MA/VR\n",
+ "\n",
+ "#Result\n",
+ "print\"Efficiency, Eta =\",int(Eta*100),\"%\"\n",
+ "\n",
+ "\n"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Efficiency, Eta = 90 %\n"
+ ]
+ }
+ ],
+ "prompt_number": 9
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example 11.2, Page no.187"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#variable declaration\n",
+ "W=480.0 #Load in N\n",
+ "P=120.0 #effort in N\n",
+ "D=500.0 #Diameter of wheel in mm\n",
+ "d=100.0 #Diameter of axle in mm\n",
+ "\n",
+ "#calculation\n",
+ "MA=W/P\n",
+ "VR=D/d\n",
+ "Eta=MA/VR\n",
+ "\n",
+ "#Result\n",
+ "print\"(i)Mechanical Advantage=\",int(MA)\n",
+ "print\"(ii)Velocity ratio=\",int(VR)\n",
+ "print\"(iii)Efficiency of machine=\",int(Eta*100),\"%\"\n",
+ "\n",
+ "\n"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "(i)Mechanical Advantage= 4\n",
+ "(ii)Velocity ratio= 5\n",
+ "(iii)Efficiency of machine= 80 %\n"
+ ]
+ }
+ ],
+ "prompt_number": 4
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example 11.3, Page no.189"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#variable declaration\n",
+ "d1=80 #larger diameter of wheel in mm\n",
+ "d2=70 #Smaller diamter of wheel in mm\n",
+ "D=250 #Diameter of effort wheel in mm\n",
+ "W=1050.0 #Load lifted in N\n",
+ "P=25.0 #Effort in N\n",
+ "\n",
+ "\n",
+ "#calculation\n",
+ "VR=2*D/(d1-d2)\n",
+ "MA=W/P\n",
+ "Eta=MA/VR\n",
+ "F_effort=P-(W/VR)\n",
+ "\n",
+ "\n",
+ "#Result\n",
+ "print\"Velocity Ratio, VR=\",int(VR) #Answer given wrongly in book. 50 is correct answer\n",
+ "print\"Efficiency, Eta=\",int(Eta*100),\"%\"\n",
+ "print\"Frictional effort lost, F_effort=\",int(F_effort),\"N\""
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Velocity Ratio, VR= 50\n",
+ "Efficiency, Eta= 84 %\n",
+ "Frictional effort lost, F_effort= 4 N\n"
+ ]
+ }
+ ],
+ "prompt_number": 8
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example 11.5, Page no.190"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#variable declaration\n",
+ "D=410.0 #Effective diameter of wheel in mm\n",
+ "d1=310.0 #Effective diameter of axle in mm\n",
+ "d2=210.0 #Effective diameter of axle in mm\n",
+ "P=25.0 #Effort in N\n",
+ "Eta=84.0/100#Efficiency\n",
+ "\n",
+ "#calculation\n",
+ "VR=2*D/(d1-d2)\n",
+ "W=Eta*P*VR\n",
+ "\n",
+ "#Result\n",
+ "print\"W=\",round(W,1),\"N\"\n",
+ "\n"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "W= 172.2 N\n"
+ ]
+ }
+ ],
+ "prompt_number": 17
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example 11.6, Page no.191"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#variable declaration\n",
+ "R=125 #Radius of larger groove in mm\n",
+ "r=115 #Radius of smaller groove in mm\n",
+ "Eta=80.0/100 #Efficiency\n",
+ "W=1500 #Load in N\n",
+ "\n",
+ "#calculation\n",
+ "VR=2*R/(R-r)\n",
+ "P=W/(Eta*VR)\n",
+ "\n",
+ "#Result\n",
+ "print\"P=\",int(P),\"N\""
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "P= 75 N\n"
+ ]
+ }
+ ],
+ "prompt_number": 18
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example 11.7, Page no.192"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#variable declaration\n",
+ "W=1800.0 #Load in N\n",
+ "P=100 #effort in N\n",
+ "T1=12 #number of teeth on larger block\n",
+ "T2=11 #number of teeth on smaller block\n",
+ "\n",
+ "#calculation\n",
+ "VR=2*T1/(T1-T2)\n",
+ "MA=W/P\n",
+ "Eta=MA/VR\n",
+ "\n",
+ "#Result\n",
+ "print\"Velocity Ratio=\",int(VR)\n",
+ "print\"Mechanical Advantage=\",int(MA)\n",
+ "print\"Efficiency=\",int(Eta*100),\"%\"\n"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Velocity Ratio= 24\n",
+ "Mechanical Advantage= 18\n",
+ "Efficiency= 75 %\n"
+ ]
+ }
+ ],
+ "prompt_number": 20
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example 11.8, Page no.193"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#variable declaration\n",
+ "T1=90.0 #No. of cogs on the effort wheel\n",
+ "T2=25.0 #No. of cogs on the effort pinion\n",
+ "T3=40.0 #No. of teeth on the spur wheel\n",
+ "T4=8.0 #No. of teeth on the load wheel\n",
+ "P=50.0 #effort in N\n",
+ "Eta=75.0/100 #Efficiency\n",
+ "\n",
+ "#calculation\n",
+ "VR=(T1/T2)*(T3/T4)\n",
+ "W=Eta*P*VR\n",
+ "\n",
+ "#Result\n",
+ "print\"W=\",int(W),\"N\""
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "W= 675 N\n"
+ ]
+ }
+ ],
+ "prompt_number": 23
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example 11.9, Page no.195"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#variable declaration\n",
+ "T=40.0 #No. of teeth on the worm wheel\n",
+ "D=300.0 #Diameter of effort wheel in mm\n",
+ "r=50.0 #radius of load drum in mm\n",
+ "W=1800.0 #Load in N\n",
+ "P=24.0 #effort in N\n",
+ "\n",
+ "#calculation\n",
+ "VR=D*T/(2*r)\n",
+ "MA=W/P\n",
+ "Eta=MA/VR\n",
+ "\n",
+ "#Result\n",
+ "print\"Efficiency=\",round(Eta*100,1),\"%\"\n",
+ "\n"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Efficiency= 62.5 %\n"
+ ]
+ }
+ ],
+ "prompt_number": 25
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example 11.10, Page no.195"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#variable declaration\n",
+ "n=2 #No. of threads\n",
+ "T=60 #No. of teeth on worm wheel\n",
+ "D=250 #Diameter of effort wheel in mm\n",
+ "r=50 #raidus of load drum in mm\n",
+ "Eta=50.0/100 #Efficiency\n",
+ "W=300 #load in N\n",
+ "\n",
+ "#calculation\n",
+ "VR=D*T/(2*n*r)\n",
+ "P=W/(Eta*VR)\n",
+ "\n",
+ "#Result\n",
+ "print\"Velocity ratio of the machine, VR=\",int(VR)\n",
+ "print\"Effort required,P=\",int(P),\"N\""
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Velocity ratio of the machine, VR= 75\n",
+ "Effort required,P= 8 N\n"
+ ]
+ }
+ ],
+ "prompt_number": 27
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example 11.11, Page no.197"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#variable declaration\n",
+ "D=200.0 #Diameter of effort wheel in mm\n",
+ "T=60.0 #No. of teeth in worn wheel\n",
+ "r=40.0 #radius of load drum in mm\n",
+ "W=9000.0 #load in N\n",
+ "P=75.0 #Effort in N\n",
+ "\n",
+ "#calculation\n",
+ "VR=(D*T)/r\n",
+ "MA=W/P\n",
+ "Eta=MA/VR\n",
+ "\n",
+ "#Result\n",
+ "print\"Efficiency=\",int(Eta*100),\"%\"\n"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Efficiency= 40 %\n"
+ ]
+ }
+ ],
+ "prompt_number": 28
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example 11.12, Page no.197"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#variable declaration\n",
+ "n=2 #No. of threads\n",
+ "D=400 #Diameter of effort wheel in mm\n",
+ "r=50 #radius of load drum in mm\n",
+ "Eta=35.0/100 #efficiency\n",
+ "P=80 #Effort in N\n",
+ "T=50 #No. of teeth in worm wheel\n",
+ "\n",
+ "#calculation\n",
+ "VR=D*T/(n*r)\n",
+ "W=P*VR*Eta\n",
+ "\n",
+ "#Result\n",
+ "print\"W=\",int(W),\"N\"\n"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "W= 5600 N\n"
+ ]
+ }
+ ],
+ "prompt_number": 30
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example 11.13, Page no.199"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#variable declaration\n",
+ "T_2=25.0 #No. of teeth on pinion\n",
+ "T_1=300.0 #No. of teeth on the spur wheel\n",
+ "r=50.0 #Radius of drum in mm\n",
+ "l=300.0 #Radius of the handle in mm\n",
+ "P=20.0 #Effort in N\n",
+ "W=300.0 #Load lifted in N\n",
+ "\n",
+ "#calculation\n",
+ "#To calculate efficiency of the machine\n",
+ "VR=int(((1/r)*(T_1/T_2))*100)\n",
+ "MA=W/P\n",
+ "Eta=MA/VR\n",
+ "#To calculate effect of friction\n",
+ "F_load=(P*VR)-W #In terms of load \n",
+ "F_effort=P-(W/VR) #In terms of effort\n",
+ "\n",
+ "#Result\n",
+ "print\"Efficiency of the machine=\",round(Eta*100,3),\"%\"\n",
+ "print\"Effect of friction in terms of load, F_load=\",int(F_load),\"N\"\n",
+ "print\"Effect of friction in terms of effort, F_effort=\",round(F_effort,1),\"N\"\n",
+ "\n"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Efficiency of the machine= 62.5 %\n",
+ "Effect of friction in terms of load, F_load= 180 N\n",
+ "Effect of friction in terms of effort, F_effort= 7.5 N\n"
+ ]
+ }
+ ],
+ "prompt_number": 31
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example 11.15, Page no.202"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#variable declaration\n",
+ "T_2=20.0 #No. of teeth of pinion\n",
+ "T_4=25.0 #No. of teeth of pinion\n",
+ "T_1=50.0 #No. of teeth on the spur wheel\n",
+ "T_3=60.0 #No. of teeth on the spur wheel\n",
+ "l=0.5 #length of the handle in m\n",
+ "r=0.25 #Radius of load drum in m\n",
+ "Eta=60.0/100 #Efficiency\n",
+ "W=720.0 #Load in N\n",
+ "#Calculation\n",
+ "VR=l/r*((T_1/T_2)*(T_3/T_4))\n",
+ "P=W/(VR*Eta)\n",
+ "\n",
+ "#Result\n",
+ "print\"P=\",int(P),\"N\""
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "P= 100 N\n"
+ ]
+ }
+ ],
+ "prompt_number": 34
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example 11.17, Page no.206"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#variable declaration\n",
+ "n=3 #No. of pulleys\n",
+ "P=50.0 #Effort in N\n",
+ "W=320.0 #Weight lifted in N\n",
+ "\n",
+ "#calculation\n",
+ "#To calculate efficiency of the machine\n",
+ "VR=2**n\n",
+ "MA=W/P\n",
+ "Eta=MA/VR\n",
+ "#To calculate effect of friction\n",
+ "F_load=(P*VR)-W #In terms of load \n",
+ "F_effort=P-(W/VR) #In terms of amount\n",
+ "\n",
+ "#Result\n",
+ "print\"Efficiency of the machine=\",int(round(Eta*100,3)),\"%\"\n",
+ "print\"Amount of friction in terms of load, F_load=\",int(F_load),\"N\"\n",
+ "print\"Amount of friction in terms of effort, F_effort=\",int(F_effort),\"N\"\n",
+ "\n",
+ "\n"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Efficiency of the machine= 80 %\n",
+ "Amount of friction in terms of load, F_load= 80 N\n",
+ "Amount of friction in terms of effort, F_effort= 10 N\n"
+ ]
+ }
+ ],
+ "prompt_number": 35
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example 11.18, Page no.208"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#variable declaration\n",
+ "n=2*5 #No. of pulleys in each block\n",
+ "P=125.0 #Effort in N\n",
+ "W=1000.0 #Weight lifted in N\n",
+ "\n",
+ "#calculation\n",
+ "VR=n\n",
+ "F_load=(P*VR)-W #In terms of load \n",
+ "F_effort=P-(W/VR) #In terms of effort\n",
+ "\n",
+ "#Result\n",
+ "print\"Amount of effort wasted in friction, F_effort=\",int(F_effort),\"N\"\n",
+ "print\"Amount of friction load, F_load=\",int(F_load),\"N\" #Answer given wrongly in book. 250 is correct answer\n",
+ "\n",
+ "\n"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Amount of effort wasted in friction, F_effort= 25 N\n",
+ "Amount of friction load, F_load= 250 N\n"
+ ]
+ }
+ ],
+ "prompt_number": 36
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example 11.19, Page no.209"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#variable declaration\n",
+ "n=4 #No. of pulleys \n",
+ "W=1800 #load lifted in N\n",
+ "Eta=75.0/100 #efficiency\n",
+ "\n",
+ "#calculation\n",
+ "VR=(2**n)-1\n",
+ "P=W/(Eta*VR)\n",
+ "F_effort=P-(W/VR)\n",
+ "\n",
+ "\n",
+ "#Result\n",
+ "print\"Effort required to lift the load,P=\",int(P),\"N\"\n",
+ "print\"Effort wasted in friction, F_effort=\",int(F_effort),\"N\""
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Effort required to lift the load,P= 160 N\n",
+ "Effort wasted in friction, F_effort= 40 N\n"
+ ]
+ }
+ ],
+ "prompt_number": 37
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example 11.20, Page no.210"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "import math\n",
+ "#variable declaration\n",
+ "p=10 #Pitch of thread in mm\n",
+ "l=400 #length of the handle in mm\n",
+ "W=2000 #load lifted in N\n",
+ "Eta=45.0/100 #Efficiency\n",
+ "\n",
+ "#calculation\n",
+ "VR=(2*math.pi*l)/p\n",
+ "P=W/(Eta*VR)\n",
+ "\n",
+ "#Result\n",
+ "print\"P=\",round(P,1),\"N\"\n"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "P= 17.7 N\n"
+ ]
+ }
+ ],
+ "prompt_number": 39
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example 11.21, Page no.212"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "import math\n",
+ "#variable declaration\n",
+ "p_1=12 #Pitch of the screw in mm\n",
+ "p_2=10 #Pitch of the screw in mm\n",
+ "l=300 #Arm length of jack in mm\n",
+ "W=7.5*1000 #Load lifted in N\n",
+ "P=30 #Effort in N\n",
+ "\n",
+ "#calculation\n",
+ "VR=int((2*math.pi*l)/(p_1-p_2))\n",
+ "MA=W/P\n",
+ "Eta=MA/VR\n",
+ "\n",
+ "#Result\n",
+ "print\"Efficiency, Eta=\",round(Eta*100,1),\"%\"\n",
+ "\n"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Efficiency, Eta= 26.5 %\n"
+ ]
+ }
+ ],
+ "prompt_number": 40
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example 11.22, Page no.212"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "import math\n",
+ "#variable declaration\n",
+ "p_1=10 #Pitch of the screw jack in mm\n",
+ "p_2=7 #Pitch of the screw jack in mm\n",
+ "l=360 #Arm length of screw jack in mm\n",
+ "W=5*1000 #Load lifted in N\n",
+ "Eta=28.0/100 #Efficiency\n",
+ "\n",
+ "#calculation\n",
+ "VR=int((2*math.pi*l)/(p_1-p_2))\n",
+ "P=W/(Eta*VR)\n",
+ "\n",
+ "#Result\n",
+ "print\"P=\",round(P,1),\"N\""
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "P= 23.7 N\n"
+ ]
+ }
+ ],
+ "prompt_number": 41
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example 11.23, Page no.214"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "import math\n",
+ "#variable declaration\n",
+ "l=300.0 #length of handle in mm\n",
+ "T=50.0 #No. of teeth in worm wheel\n",
+ "p=10.0 #Pitch of screw in mm\n",
+ "P=100.0 #Effort applied in N\n",
+ "W=100000.0 #Load lifted in N\n",
+ "n=2 #no. of threads\n",
+ "#calculation\n",
+ "VR=int((2*math.pi*l*T)/(n*p))\n",
+ "MA=W/P\n",
+ "Eta=MA/VR\n",
+ "\n",
+ "#Result\n",
+ "print\"Efficiency, Eta=\",round(Eta*100,1),\"%\"\n"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Efficiency, Eta= 21.2 %\n"
+ ]
+ }
+ ],
+ "prompt_number": 43
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [],
+ "language": "python",
+ "metadata": {},
+ "outputs": []
+ }
+ ],
+ "metadata": {}
+ }
+ ]
+}
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