Each of the three helicopter rotor blades shown in Fig. 10-67 is5.20 m long and has a mass of 297 kg. The rotor is rotating at 215rev/min. (a) What is the rotational inertia of therotor assembly about the axis of rotation? (Each blade can beconsidered to be a thin rod rotated about one end.)(b) What is the total kinetic energy of rotation?