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05. A semi-infinite skab of copper is maintained at an initially uniform temperature of 30C. a-If the surface temperature is suddenly raised to 220C; Calculate the temperature at a depth of 5 cm after 1 minute. Determine the heat flux on the surface of the slab. b. If the heat flux in (a) is exposed to the surface of the slab as a constant heat flux; Determine the temperature at a depth of 5 cm after 1 minute