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D=40.0 //Screw diameter
l=20.0 //Screw lwngth
p=l/3.0 //Lead of the screw
W=40000.0 //effort
R = 400 //Lever length
u = 0.12 //coefficient of friction between screw and nut
P = (D/(2*R))*W*((u+(p/(3.14*D)))/(1-u*(p/(3.14*D)))) //Effort
printf("\n Effort is %0.3f N",P)
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