A helicopter rotor blade can be considered a long thin rod, as shown in Fig. 8-46. (a)

Question:

A helicopter rotor blade can be considered a long thin rod, as shown in Fig. 8-46.
(a) If each of the three rotor helicopter blades is 3.75m long and has a mass of 160kg. Calculate the moment of inertia of the three rotor blades about the axis of rotation.
(b) How much torque must the motor apply to bring the blades up to a speed of 5.0 rev/s in 8.0s?