:formula_5:formula_6:formula_7:"g" is the acceleration along the radius (m·s−2),:"S" is the cross-section area of the cable at any given point r, (m2) and dS its variation (m2 as well),:"ρ" is the density of the material used for the cable (kg·m−3).
In the constant-stress case, the cross-section follows this differential equation::formula_5or:formula_6or:formula_7where:"g" is the acceleration along the radius (m·s−2),:"S" is the cross-section area of the cable at any given point r, (m2) and dS its variation (m2 as well),:"ρ" is the density of the material used for the cable (kg·m−3).