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An airplane propeller is 1.95m in length (from tip to tip) with mass 122kg and is rotating at 2500rpm(rev/min) about an axis through its center. You can model the propeller as a slender rod. Suppose that, due to weight constraints, you had to reduce the propeller's mass to 75% 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?

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