Calculate the natural frequencies of a clamped-clamped beam for the physical parameters l = 1 m, E = 2 x 1011 N/m2 , ρ = 7800 K/>m3 , I = 10-6 m4 , and A = 10-2 m2 , using the beam theory of Chapter 6 and a four-element finite element model of the beam.