What is the tensile stress acting on a test piece if a tensile force of 1.0 kN is applied to a cross-sectional area of 50 mm2 ? A pipe has an external diameter of 35 mm and an internal diameter of 30...

What is the tensile stress acting on a test piece if a tensile force of 1.0 kN is applied to a cross-sectional area of 50 mm2 ?

A pipe has an external diameter of 35 mm and an internal diameter of 30 mm. What is the tensile stress acting on the pipe if it is subject to a tensile axial load of 800 N?