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Water at 28 degrees C flows in a straight horizontal pipe in which there is no exchange of either heat or work with teh surroundings. Its velocity is 14 m/s in a pipe with an internal diameter of 2.5 cm until it flows into a section where the pipe diamter abruptly increases. What is the temperature change of the water if the downstream diameter is 3.8 cm? If it is 7.5 cm? What is the maximum temperature change for an enlargement in the pipe?

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