Consider two bars having the same diameter D, and lengths L1 and L2, that are kept in a line aligned axially. If an axial load P acts on them, which of the following expressions correctly gives the total elongation (ΔL) of the combined bar system?

A cylindrical rod of 200 mm length and 30 mm diameter is subjected to an axial pull of 90 kN. What will be the approximate stress developed in the rod?

A cantilever beam of 5 m length carries a vertical uniformly varying load that varies from 0 at the free end B to a maximum value of 50 kN/m at the fixed end A. What is the Shear Force at a distance of 2 m from the free end B?