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+//To find the torque required
+clc
+//Given:
+D=150/1000 //m
+ps=2*10^6 //N/m^2
+d0=50,p=6 //mm
+mu=0.12
+//Solution:
+//Calculating the load on the valve
+W=ps*%pi/4*D^2 //N
+//Calculating the mean diameter of the screw
+d=(d0-p/2)/1000 //m
+//Calculating the helix angle
+alpha=atan(p/(%pi*d*1000))
+//Calculating the force required to turn the handle
+phi=atan(mu) //Limiting angle of friction, radians
+P=W*tan(alpha+phi) //N
+//Calculating the torque required to turn the handle
+T=P*d/2 //N-m
+//Results:
+printf("\n\n The torque required to turn the handle, T = %.1f N-m.\n\n",T) \ No newline at end of file