Question: A ceiling fan has four thin blades that are 1 1 0 cm long each. Each fin weighs about 0 . 7 5 kg .

A ceiling fan has four thin blades that are 110 cm long each. Each fin weighs about 0.75 kg . At low speed, the fan makes 60 revolutions per minute. At high speeds, the fan rotates at 360 revolutions per minute. Neglecting air resistance, how much external work would be required to bring the fan from low to high speed?

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