Assignment:
A helicopter has 3 blades, each of them are 5.20m long and has a mass of 220kg.(each blade has a mass of 220kg, not the sum of the 3) The rotor is rotating at 385 rev/min.
a) What is the rotational inertia of the rotor assembly about the axis of rotation? (Each blade can be considered to be a thin rod rotated about one end.) ____kg*m^2
b) What is the total kinetic energy of rotation?___MJ
Provide complete and step by step solution for the question, use formulas.