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Para endurecer una esfera de acero que tiene un dimetro de 50,8 mm, se calienta a 1033 K y luego se sumerge en un bao

Para endurecer una esfera de acero que tiene un dimetro de 50,8 mm, se calienta a 1033 K y luego se sumerge en un bao de agua grande a 300 K. Determine el tiempo para que el centro de la esfera alcance 366,5 K y la temperatura a 10 mm desde el centro El coeficiente de superficie se puede asumir como 710 W/m^2.K y k=45 W/mK y alfa=0.0325 m2/h.

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