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+//required effort
+//differential axle diameters
+d1=300 //mm
+d2=250 //mm
+//wheel diameter
+D=800 //mm
+//load
+W=20000 //N
+eta=0.55
+VR=(2*D)/(d2-d1)
+MA=eta*VR
+P=W/MA //N
+printf("Required effort =%0.1f N",-P)