initial commit / add all books

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diff --git a/1325/CH4/EX4.1/4_1.PNG b/1325/CH4/EX4.1/4_1.PNG
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diff --git a/1325/CH4/EX4.1/4_1.sce b/1325/CH4/EX4.1/4_1.sce
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+//To find the extreme angular velocities of the driven shaft and its maximum acceleration

+clc

+//given

+rpm=1000

+angle=20//degree

+ang=(angle*%pi)/180

+printf("\n")

+w=2*%pi*rpm/60

+printf("The angular velocity of the driving shaft is %.1f rad/s \n",w)

+//maximum value of w1=w/cos(angle) and minimum value w2=w*cos(angle)

+w1=w/cos(ang)

+w2=w*cos(ang)

+printf("Extreme angular velocities :-\n")

+printf("maximum value of angular velocity w1=%.1f rad/s \nminimum value of angular velocity w2=%.1f rad/s\n",w1,w2)

+//using equation 4.11, cos(2x)=(2*sin(angle)^2)/(2-sin(angle)^2)

+x=acos((2*sin(ang)^2)/(2-sin(ang)^2))*180/(%pi)

+y=360-x//for cosine inverse, angle and 360-angle are same and must be considered

+x1=x/2

+y1=y/2

+printf("The acceleration of driven shaft is a maximum when theta =%.2f or %.2f degrees\n",x1,y1)

+amax=(w^2*cos(ang)*(sin(ang)^2)*sin(x*%pi/180))/((1-((cos(x1*%pi/180)^2)*(sin(ang)^2)))^2)//maximum angular acceleration, numerically

+printf("Maximum angular acceleration is %.f rad/s^2\n",amax)

+