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158 A large heated steel block (=7832kg/m3, cp=434J/kgK,k=63.9W/mK, and =18.8106m2/s)is allowed to cool in a room at 25C. The steel block has an initial temperature of 450C, and the convection heat transfer coefficient is 25W/m2K. Assuming that the steel block can be treated as a quarter-infinite medium, determine the temperature at the edge of the steel block

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after 10minof cooling.