A Blacksmith Is Flattening a Steel Plate That Measures 10

question 61

Multiple Choice

A blacksmith is flattening a steel plate that measures 10 cm × 15 cm × 1 mm. He has heated the plate to 900 K. If the emissivity of the plate is 0.75, what is the total rate at which it radiates energy? The Stefan-Boltzmann constant is 5.670 × 10^-8 W/m² · K⁴. Ignore any heat it receives from the surroundings.

• A) 360 W
• B) 760 W
• C) 790 W
• D) 850 W
• E) 880 W

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