(Answered) A helicopter has 3 blades each of them are 520m long and

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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.)

b) What is the total kinetic energy of rotation?

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