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                Energy 5
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            What is the temperature of a black ball orbiting the Earth?
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            <h4>A black ball of radius 10 cm is placed in orbit around the Earth. What is its temperature?</h4>

<h4>Intensity of sun = 1400 Wm<sup>-2</sup></h4>

<h4>&sigma; = 5.6 x 10<sup>-8</sup> Wm<sup>-2</sup>K<sup>-4</sup></h4>

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