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Two parallel planes 9 0 by 6 0 cm are separated by a distance of 6 0 cm . One plane is maintained at a

Two parallel planes

90

60

cm are separated by a distance of

60

.

One plane

is maintained at a temperature of

800

K and has an emissivity of

0.6 .

The other

plane is insulated. The planes are placed in a large room that is maintained at

290

.

Calculate the temperature of the insulated plane and the energy lost by the heated

plane.

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