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3. A bunker is made of concrete stone, which has a thermal diffusivity of 0.69mm2/s. Imagining the bunker is under extremely heat attack for ten

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3. A bunker is made of concrete stone, which has a thermal diffusivity of 0.69mm2/s. Imagining the bunker is under extremely heat attack for ten hours, determine the minimum concrete thickness to avoid any impact from the heat attack. You assume the temperature of concrete bottom remain unchanged during this period

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