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A very long rod 5mm in diameter has one end that is held at 100C. The surface of the rod is exposed to ambient air

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A very long rod 5mm in diameter has one end that is held at 100C. The surface of the rod is exposed to ambient air at 25C with a convective heat transfer coefficient of 100W/m2K. Calculate the length of the rod. a. x=0.25m b. x=0.21m c. x=0.1m d. x=0.19m

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