2.21-2.25. Assuming the inertia of the elastic elements is small, use a one-degree-of-freedom model to approximate the natural frequency of the system. 120 FUNDAMENTALS OF MECHANICAL VIBRATIONS 0.8 m FIGURE P2.21 E-210 x 10 N/m² I-1.6 x 10-5 m E-210 x 10 N/m² m² A 2.1 x 10 L= 0.65 m FIGURE P2.22 T 150 kg T. 165 kg E = 180 x 109 N/m² A 2.1 x 10 m² L-0.35 m 0.6 m 0.4 m - 65 kg T. E-180 x 10 N/m² / 4.6 x 10m* FIGURE P2.23