Consider a long brass bar of cross sectional area 2.99 x10−4 m2. The hot end is maintained at 425.3 °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 3.3 J/s. What is the temperature of the bar at a point 0.36 m from the hot end?

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