A very long rectangular aluminum bar has a cross-section 5 cm x 14 cm. | Cheap Nursing Papers

A very long rectangular aluminum bar has a cross-section 5 cm x 14 cm.

A very long rectangular aluminum bar has a cross-section 5 cm x 14 cm. If the bar is initially at 220°C, and its surface temperature is suddenly reduced to 40 °C, how long will it take for the center to reach 150 °C ?

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