Assertion: turbine's speed | /r/HasProperty | written as rotational speed of the wind
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Source sentences:
text: The speed at the tip of the blade is usually used for this purpose, and is written as the product of the blade radius r and the rotational speed of the wind: U = Ω r {\displaystyle U=\Omega r} , where Ω {\displaystyle \Omega } is the rotational velocity in radians/