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//Screw jack parameters
p=10 //mm
d=50 //mm
W=6000 //N
theta=atand(p/(%pi*d)) //degree
fi=atand(0.05) //degree
R=300 //mm
P=(d*W*tand(theta+fi))/(2*R) //N
VR=(2*%pi*R)/(p)
MA=W/P
eta=MA*100/VR //percent
//torque required to keep the load from descending
T=(50*600*tand(3.6426-2.8624))/2 //N-mm
printf("Efficiency eta=%0.2f percent > 50 percent\nThus the screw jack is not self locking\nTorque required to keep the load from descending T=%0.2f N-mm",eta,T)
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