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英语翻译A jet of water from a 25mm diameter nozzle is directed v

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英语翻译
A jet of water from a 25mm diameter nozzle is directed vertically upward.Assuming that the jet remains circular and neglecting any loss of energy,what will be the diameter of the jet at a point 4.5m above the nozzle if the velocity with which the jet leaves the nozzle is 12m/s?
英语翻译A jet of water from a 25mm diameter nozzle is directed v
一柱水柱从直径25毫米的喷口垂直向上喷出.假设水柱保持圆形并不计能力损失,水柱离开喷口时的速度是12米每秒,那么当水柱到达喷口以上4.5米位置时,水柱的直径是多少?