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                Energy production 2
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            How many turbines are needed to provide power for a village?
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            <h4>At peak times a small village requires 850 kW of electrical power. They measure the average wind speed to be 8.0 ms<sup>-1</sup>. They decide to build several turbines with blade length 45m. How many will they need if the turbines are 25% efficient?</h4>

<h4>air density = 1.2 kgm<sup>-3</sup></h4>

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