1950 AMC 12 第 33 题
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33.
内径为 英寸的圆管需要多少根,才能与一根内径为 英寸的圆管输送相同的水量?
The number of circular pipes with an inside diameter of inch which will carry the same amount of water as a pipe with an inside diameter of inches is:
答案:D
小提示:
输水能力与横截面积成正比
Water-carrying capacity is proportional to cross-sectional area
大提示:
圆的面积与直径的平方成正比
Circular area scales as the square of the diameter
解答:
两种圆管的直径之比为 ,所以横截面积之比为 因此, 根小圆管的横截面积之和等于大圆管的横截面积。
因此,正确答案是 D。
The ratio of the diameters is so the ratio of cross-sectional areas is Thus of the smaller pipes have the same total cross-sectional area as the larger pipe.
Thus, the correct answer is D.
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