1. (15 pts) Consider the stiffness matrix for a two point Euler-Bernoulli beam element along the x- axis, without consideration of the axial force effects [k11 k12 k13 k14] ... K = ... k14 a) Sketch the element and show all of its degrees of freedom (displacements) numbered 1 to 4 and nodal forces, numbered correspondingly b). What is the physical meaning, in terms of the nodal forces and displacements you have shown in a), of k21 ? c) K13?