Problem 3.10 An electric motor of total weight W-3330 lb is mounted on a simple supported beam with overhang as shown in Fig. P3.10. The unbalance of the rotor is W'e = 50 Ib-in. (a) Find the amplitudes of forced vertical vibration of the motor for speeds 800, 1000, and 1200 rpm. (b) Draw a rough plot of the amplitude versus rpm. Assume damping equal to 10% of critical damping. El 30 x 10 bin² 10 Fig. P3.10 +2.5-+-2.5--