An electric heater with the total surface area of 025m2 and, Physics

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An electric heater with the total surface area of 025m2 and

Question: An electric heater with the total surface area of 0.25m^2 and emissivity of 0.75 is in a room where the air has a temp of 20 degrees Celsius and the walls are at 10 degrees Celsius. When the heater consumes 500W of electric power, its surface has a steady temperature of 120 degrees Celsius.

Part A- Determine the temperature of the heater surface when it consumes 700W of power.

I need help to calculate the temperature of the heater surface.

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Physics: An electric heater with the total surface area of 025m2 and

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Physics: An electric heater with the total surface area of 025m2 and

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