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一、风的计算例1某地区的平均风速是6 m/s,已知空气的密度是1.2 kg/m~3.此地有一风车,它的车叶转动时可以形成面积约为1200 m~2的圆面,求:(1)平均1 s时间内有多少质量的气流冲击风车车叶形成的圆面?(2)已知1 kg空气以这
A. Wind Calculation Example 1 The average wind speed in a certain area is 6 m / s, and the density of air is known to be 1.2 kg / m ~ 3. There is a windmill whose area of rotation is about 1200 m ~ 2 (1) How many masses of air flow impact the circular surface of the windmill vane in an average time of 1 s? (2) It is known that 1 kg of air takes this