6) In the Saint-Venant's case of COMBINED AXIAL FORCE AND FLEXURE, the nucleus of inertia gives an idea of the position of the neutral axis of a cross-section in function of: a) the eccentricity of the axial force with respect to the centre of pressure; b) the eccentricity of the axial force with respect to the centre of gravity of the section; c) the eccentricity of the shear force with respect to the centre of shear of the section. 7) An OPEN thin-walled cross-section subjected to PURE TORQUE is characterized by: a) shear stress components Tax Ty varying linearly along the thickness of the cross-section and no σz; b) shear stress components Tx. Tzy constant along the thickness of the cross-section and σ c) shear stress components Tx, y constant along the thickness of the cross-section and no σz.

6) In the Saint-Venant's case of COMBINED AXIAL FORCE AND FLEXURE, the nucleus of inertia gives an idea of the position of the neutral axis of a cross-section in function of: a) the eccentricity of the axial force with respect to the centre of pressure; b) the eccentricity of the axial force with respect to the centre of gravity of the section; c) the eccentricity of the shear force with respect to the centre of shear of the section. 7) An OPEN thin-walled cross-section subjected to PURE TORQUE is characterized by: a) shear stress components Tax Ty varying linearly along the thickness of the cross-section and no σz; b) shear stress components Tx. Tzy constant along the thickness of the cross-section and σ c) shear stress components Tx, y constant along the thickness of the cross-section and no σz.