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-{
- "cells": [
- {
- "cell_type": "markdown",
- "metadata": {},
- "source": [
- "# Chapter 1-INTRODUCTION TO MECHANICS OF SOLIDS "
- ]
- },
- {
- "cell_type": "markdown",
- "metadata": {},
- "source": [
- "# example1.1 Page number 10\n"
- ]
- },
- {
- "cell_type": "code",
- "execution_count": 1,
- "metadata": {
- "collapsed": false
- },
- "outputs": [
- {
- "name": "stdout",
- "output_type": "stream",
- "text": [
- " The resultant velocity : 21.54 km/hour\n",
- "68.2 °\n"
- ]
- }
- ],
- "source": [
- "#downstream direction as x\n",
- "#direction across river as y\n",
- "\n",
- "from math import sqrt,atan,pi\n",
- "\n",
- "#variable declaration\n",
- "\n",
- "Vx= 8 #velocity of stream, km/hour\n",
- "Vy=float(20) #velocity of boat,km/hour\n",
- "\n",
- "V=sqrt(pow(Vx,2)+pow(Vy,2)) #resultant velocity, km/hour\n",
- "theta=Vy/Vx\n",
- "\n",
- "alpha= atan(theta)*180/pi #angle, degrees \n",
- "\n",
- "print \" The resultant velocity :\",round(V,2),\"km/hour\"\n",
- "print round(alpha,2),\"°\"\n",
- "\n"
- ]
- },
- {
- "cell_type": "markdown",
- "metadata": {},
- "source": [
- "# example 1.2 Page number 10"
- ]
- },
- {
- "cell_type": "code",
- "execution_count": 2,
- "metadata": {
- "collapsed": false
- },
- "outputs": [
- {
- "name": "stdout",
- "output_type": "stream",
- "text": [
- "10.0 KN (to the left)\n",
- "17.32 KN (downward)\n"
- ]
- }
- ],
- "source": [
- "\n",
- "\n",
- "\n",
- "#components of force in horizontal and vertical components. \n",
- "from math import cos,sin,pi\n",
- "#variable declaration\n",
- "\n",
- "F= 20 #force in wire, KN\n",
- "\n",
- "#calculations\n",
- "Fx= F*cos(60*pi/180) \n",
- "Fy= F*sin(60*pi/180)\n",
- "\n",
- "print round(Fx,2),\"KN\" ,\"(to the left)\"\n",
- "print round(Fy,2), \"KN\" ,\"(downward)\"\n",
- "\n",
- "\n"
- ]
- },
- {
- "cell_type": "markdown",
- "metadata": {},
- "source": [
- "# example 1.3 Page number 11"
- ]
- },
- {
- "cell_type": "code",
- "execution_count": 3,
- "metadata": {
- "collapsed": false
- },
- "outputs": [
- {
- "name": "stdout",
- "output_type": "stream",
- "text": [
- "Component normal to the plane : 9.4 KN\n",
- "Component parallel to the plane : 3.42 KN\n"
- ]
- }
- ],
- "source": [
- "\n",
- "\n",
- " #The plane makes an angle of 20° to the horizontal. Hence the normal to the plane makes an angles of 70° to the horizontal i.e., 20° to the vertical\n",
- "from math import cos,sin,pi\n",
- "#variable declaration\n",
- "W= 10 # black weighing, KN\n",
- "\n",
- "#calculations\n",
- "\n",
- "Nor= W*cos(20*pi/180) #Component normal to the plane\n",
- "para= W*sin(20*pi/180) #Component parallel to the plane\n",
- "\n",
- "print \"Component normal to the plane :\",round(Nor,2),\"KN\"\n",
- "print \"Component parallel to the plane :\",round(para,2) , \"KN\"\n",
- "\n",
- "\n",
- "\n"
- ]
- },
- {
- "cell_type": "markdown",
- "metadata": {},
- "source": [
- "# example 1.4 Page number 11"
- ]
- },
- {
- "cell_type": "code",
- "execution_count": 4,
- "metadata": {
- "collapsed": false
- },
- "outputs": [
- {
- "name": "stdout",
- "output_type": "stream",
- "text": [
- "F1= 100.0 N\n",
- "F2= 200.0 N\n",
- "theta= 63.9 °\n"
- ]
- }
- ],
- "source": [
- "\n",
- "\n",
- "#Let the magnitude of the smaller force be F. Hence the magnitude of the larger force is 2F\n",
- "\n",
- "from math import pi,sqrt, acos\n",
- "#variable declaration\n",
- "R1=260 #resultant of two forces,N\n",
- "R2=float(180) #resultant of two forces if larger force is reversed,N\n",
- "\n",
- "\n",
- "\n",
- "#calculations\n",
- "\n",
- "F=sqrt((pow(R1,2)+pow(R2,2))/10)\n",
- "F1=F\n",
- "F2=2*F\n",
- "theta=acos((pow(R1,2)-pow(F1,2)-pow(F2,2))/(2*F1*F2))*180/pi\n",
- "\n",
- "print \"F1=\",F1,\"N\"\n",
- "print \"F2=\",F2,\"N\"\n",
- "print \"theta=\",round(theta,1),\"°\"\n",
- "\n",
- "\n"
- ]
- },
- {
- "cell_type": "markdown",
- "metadata": {},
- "source": [
- "# example 1.5 Page number 12"
- ]
- },
- {
- "cell_type": "code",
- "execution_count": 5,
- "metadata": {
- "collapsed": false
- },
- "outputs": [
- {
- "name": "stdout",
- "output_type": "stream",
- "text": [
- "F1= 326.35 N\n",
- "F2= 223.24 N\n"
- ]
- }
- ],
- "source": [
- "\n",
- "\n",
- "#Let ?ABC be the triangle of forces drawn to some scale\n",
- "#Two forces F1 and F2 are acting at point A\n",
- "#angle in degrees '°'\n",
- "\n",
- "from math import sin,pi\n",
- " \n",
- "#variabble declaration\n",
- "cnv=pi/180\n",
- "\n",
- "BAC = 20*cnv #Resultant R makes angle with F1 \n",
- " \n",
- "ABC = 130*cnv \n",
- "\n",
- "ACB = 30*cnv \n",
- "\n",
- "R = 500 #resultant force,N\n",
- "\n",
- "#calculations\n",
- "#sinerule\n",
- "\n",
- "F1=R*sin(ACB)/sin(ABC)\n",
- "F2=R*sin(BAC)/sin(ABC)\n",
- "\n",
- "print \"F1=\",round(F1,2),\"N\"\n",
- "print \"F2=\",round(F2,2),\"N\"\n",
- "\n",
- "\n"
- ]
- },
- {
- "cell_type": "markdown",
- "metadata": {},
- "source": [
- "# example 1.6 Page number 12"
- ]
- },
- {
- "cell_type": "code",
- "execution_count": 6,
- "metadata": {
- "collapsed": false
- },
- "outputs": [
- {
- "name": "stdout",
- "output_type": "stream",
- "text": [
- "theta= 78.13 °\n",
- "alpha= 29.29 °\n"
- ]
- }
- ],
- "source": [
- "\n",
- "\n",
- "#Let ABC be the triangle of forces,'theta' be the angle between F1 and F2, and 'alpha' be the angle between resultant and F1 \n",
- "\n",
- "from math import sin,acos,asin,pi\n",
- "\n",
- "#variable declaration\n",
- "cnv= 180/pi\n",
- "F1=float(400) #all forces are in newtons,'N'\n",
- "F2=float(260)\n",
- "R=float(520)\n",
- "\n",
- "#calculations\n",
- "\n",
- "theta=acos((pow(R,2)-pow(F1,2)-pow(F2,2))/(2*F1*F2))*cnv\n",
- "\n",
- "alpha=asin(F2*sin(theta*pi/180)/R)*cnv\n",
- "\n",
- "print\"theta=\",round(theta,2),\"°\"\n",
- "print \"alpha=\",round(alpha,2),\"°\"\n",
- "\n"
- ]
- },
- {
- "cell_type": "markdown",
- "metadata": {},
- "source": [
- "# example 1.7 Page number 13"
- ]
- },
- {
- "cell_type": "code",
- "execution_count": 7,
- "metadata": {
- "collapsed": false
- },
- "outputs": [
- {
- "name": "stdout",
- "output_type": "stream",
- "text": [
- "horizontal component= 2814.2 N\n",
- "Vertical component = 1039.2 N\n",
- "Component along crank = 507.1 N\n",
- "Component normal to crank= 2956.8 N\n"
- ]
- }
- ],
- "source": [
- "\n",
- "\n",
- "#The force of 3000 N acts along line AB. Let AB make angle alpha with horizontal.\n",
- "\n",
- "from math import cos,sin,pi,asin,acos\n",
- "\n",
- "#variable declaration\n",
- "F=3000 #force in newtons,'N'\n",
- "BC=80 #length of crank BC, 'mm'\n",
- "AB=200 #length of connecting rod AB ,'mm'\n",
- "theta=60*pi/180 #angle b/w BC & AC\n",
- "\n",
- "#calculations\n",
- "\n",
- "alpha=asin(BC*sin(theta)/200)*180/pi\n",
- "\n",
- "HC=F*cos(alpha*pi/180) #Horizontal component \n",
- "VC= F*sin(alpha*pi/180) #Vertical component \n",
- "\n",
- "#Components along and normal to crank\n",
- "#The force makes angle alpha + 60 with crank.\n",
- "alpha2=alpha+60\n",
- "CAC=F*cos(alpha2*pi/180) # Component along crank \n",
- "CNC= F*sin(alpha2*pi/180) #Component normal to crank \n",
- "\n",
- "\n",
- "print \"horizontal component=\",round(HC,1),\"N\"\n",
- "print \"Vertical component = \",round(VC,1),\"N\"\n",
- "print \"Component along crank =\",round(CAC,1),\"N\"\n",
- "print \"Component normal to crank=\",round(CNC,1),\"N\""
- ]
- }
- ],
- "metadata": {
- "anaconda-cloud": {},
- "kernelspec": {
- "display_name": "Python [Root]",
- "language": "python",
- "name": "Python [Root]"
- },
- "language_info": {
- "codemirror_mode": {
- "name": "ipython",
- "version": 2
- },
- "file_extension": ".py",
- "mimetype": "text/x-python",
- "name": "python",
- "nbconvert_exporter": "python",
- "pygments_lexer": "ipython2",
- "version": "2.7.12"
- }
- },
- "nbformat": 4,
- "nbformat_minor": 0
-}
generated by cgit (git 2.34.1) at 2024-12-19 14:55:12 +0000