initial commit / add all books

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+//To find ratio of torques and efficiency

+clc

+//Given:

+d=50,p=12.5 //mm

+mu=0.13

+W=25*1000 //N

+//Solution:

+//Calculating the helix angle

+alpha=atan(p/(%pi*d)) //radians

+//Calculating the force required on the screw to raise the load

+phi=atan(mu) //Limiting angle of friction, radians

+P1=W*(alpha+phi) //N

+//Calculating the torque required on the screw to raise the load

+T1=P1*d/2 //N-mm

+//Calculating the force required on the screw to lower the load

+P2=W*tan(phi-alpha) //N

+//Calculating the torque required to lower the load

+T2=P2*d/2 //N

+//Calculating the ratio of the torques required

+r=T1/T2 //Ratio of the torques required, N-mm

+//Calculating the efficiency of the machine

+eta=tan(alpha)/tan(alpha+phi)*100 //%

+//Results:

+printf("\n\n Torque required on the screw to raise the load, T1 = %d N-mm.\n",T1)

+printf(" Ratio of the torque required to raise the load to the torque required to lower the load = %.1f.\n",r)

+printf(" Efficiency of the machine, eta = %.1f %c.\n\n",eta,"%")
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