Ptt 大爆卦 | 7cm to m - 前往 https://www.quora.com/Through-a-tap-with-an-inner-diameter-of-7-cm-water-flows-at-the-rate-of-10m-s-how-long-will-this-tap-take-to-fill-a-circular-with-a-diameter-of-2m-and-height-of-4-9m

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Through a tap with an inner diameter of 7 cm water flows at ...

7 cm = 0.07 m. Let, it will take t seconds. Flow rate = Π*{(0.07 / 2)^2}*10 cu m / sec. Volume to be filled =Π*{(2 / 2)^2}*4.9 cu m.

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