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A thermal insulator material with a maximum conductive heat conduction coefficient of 0.05 W/mK and a minimum convective heat transfer coefficient of 5 W/m2K

A thermal insulator material with a maximum conductive heat conduction coefficient of 0.05 W/mK and a minimum convective heat transfer coefficient of 5 W/m2K will be used on the outer surface of a pipe. Find the critical insulator radius. (rcr=?)

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