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2. Data were obtained from measurements on a vertical section of old, corroded, galvanized iron pipe of 50mm inside diameter. At one section, the pressure

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2. Data were obtained from measurements on a vertical section of old, corroded, galvanized iron pipe of 50mm inside diameter. At one section, the pressure was p1=750kPa (gage); at the other section, 40m lower, the pressure was p2=250kPa (gage). The flow rate of water was 0.015m3/s. Estimate the roughness of the pipe. [Answer: 0.507mm ]

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