Consider a long brass bar of cross sectional area 2.41 x10−4 m2.  The hot end is maintained at 421.3 °C, while the other end is kept at a constant, but lower temperature.  The bar is insulated on its sides, losing heat only at the colder end.  Heat flows through the bar at the rate of 4.38 J/s. What is the temperature of the bar at a point 0.441 m from the hot end?

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