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A cylindrical electrical resistor with a radius of 1 mm and an emissivity of 0.8 has a surface of 1000 K. It is located inside

A cylindrical electrical resistor with a radius of 1 mm and an emissivity of 0.8 has a surface of 1000 K. It is located inside a room whose walls are at a temperature of 300 K and have an emissivity of 0.3. Calculate the length of the resistor, knowing that the heat flux through the resistor is 0.2 kcal/s

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