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Statement of a problem № 3171

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A helicopter of mass 500 kg hovers when its rotating blades move through an area of 45 m2 . Find the average speed imparted to air (density of air = 1.3 kg/m3 and g = 9.8 m/s2 )

Solution:
A helicopter of mass 500 kg hovers when its rotating blades move through an area

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