A circular air-conditioning duct carries cool air at 2℃ and is constructed of 1 percent carbon steel with a thickness of 0.2 mm and an outside diameter of 16 cm. The duct is in a horizontal position and gains heat from room air at 25℃. If the average air velocity in the duct is 9.0 m/s, estimate the air temperature rise in a duct run of 25 m. Be sure to state your assumptions in arriving at an answer
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ur question is sooo long
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