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physics

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A ceiling fan has four blades, each with a mass of 0.40 kg and a length of 65 cm. Model each blade as a rod connected to the fan axle at one end. When the fan is turned on, it takes 4.45 s for the fan to reach its final angular speed of 2.3 rev/s. What torque was applied to the fan by the motor? Ignore torque due to the air.

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