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An electric current passes through a metal strip 0.59 cm by 4.2 cm by 0.17 mm...

An electric current passes through a metal strip 0.59 cm by 4.2 cm by 0.17 mm , heating it at the rate of 43 W . The strip has emissivity e=1.0and its surroundings are at 250 K . What will be the temperature of the strip if it's enclosed in (a) a vacuum bottle transparent to all radiation and (b) an insulating box with thermal resistance R = 8.9 K/W that blocks all radiation?

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The input power is .:. The temperature 43 W 1+(250K 5.670x10 Wimk)x 2x 3.14x (0.0059 m +0.042m+0.00017m) 11 759.13K The inp

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