If each of the three rotor helicopter blades is 3.75m long and has a mass of 135kg, calculate the moment of inertia of the three rotor blades about the axis of rotation.

I_total=1900kg*m2.

How much torque must the motor apply to bring the blades from rest up to a speed of 4.0 rev/s in 7.9s ?Express your answer to two significant figures and include the appropriate units.