A Blacksmith Is Flattening a Steel Plate Having Dimensions $10 \mathrm {~cm} \times 15 \mathrm {~cm} \times 1 \mathrm {~mm}$

A blacksmith is flattening a steel plate having dimensions $10 \mathrm {~cm} \times 15 \mathrm {~cm} \times 1 \mathrm {~mm}$
He has heated the plate to 900 K. If the emissivity of the plate is 0.75 , at what rate does it lose energy by radiation? Ignore any heat exchange with the surroundings. $\left( \sigma = 5.67 \times 10 ^ { - 8 } \mathrm {~W} / \mathrm { m } ^ { 2 } \cdot \mathrm { K } ^ { 4 } \right)$

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

Correct Answer:

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