Each propeller on a King Air twin-engine airplane consists of three blades, each of mass 21 kg and length 121 cm. The blades may be treated approximately as uniform, thin rods. What is the rotational inertia of the propeller, and if the propeller is driven by an engine that develops a torque of 2650 N⋅m, how long will it take to change the propeller's angular speed from 1250 rpm to 1850 rpm?

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