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An electric resistance wire heater 0.00015 m in diameter is placed perpendicular to an air flow. It holds a temperature of 60C in a 20C

An electric resistance wire heater 0.00015 m in diameter is placed perpendicular to an air flow. It holds a temperature of 60C in a 20C air flow while it dissipates 25 W/m of heat to the flow. How fast is the air flowing?

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