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Question: An airplane propeller is 2.00m in length (from tip to tip) with mass 130kg and is rotating at 3000rpm (rev/min) about an axis through its center. You can model the propeller as a slender rod.

Question I: what is its rotational kinetic energy in J?

Question II: Suppose that, due to weight constraints, you had to reduce the propeller's mass to 75.0% of its original mass, but you still needed to keep the same size and kinetic energy. What would its angular speed have to be, in rpm?

I need expert help to solve the above question.

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