A residential size WT has a diameter of 1 meter. Due to the size, its efficiency is

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A residential size WT has a diameter of 1 meter. Due to the size, its efficiency is only \(25 \%\) of the Betz limit. What is the expected power output at a wind speed of 20 miles per hour? Assume the air density is \(1.225 \mathrm{~kg} / \mathrm{m}^{3}\).

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