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Fluid dynamics of the water mains

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What gauge pressure in the water mains is necessary if a firehose is to spray water to a height of 15m?

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Fluid Dynamic and Flow Rate

A horizontal water main with a cross-sectional area of 200 cm^2 necks down to a pipe of area 50 cm^2. Meters mounted in the flow on each side of the transition coupling show a change in gauge pressure of 80 kPa. Determine the flow rate through the system, taking the fluid to be ideal.

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