Physics for Scientists and Engineers: A Strategic Approach 5th Edition · Work, Heat, and the First Law of Thermodynamics · Problem 81
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Randall D. Knight — Work, Heat, and the First Law of Thermodynamics: Problem 81
A satellite to reflect radar is a 2.0-m-diameter, 2.0-mm-thick spherical copper shell. While orbiting the earth, the satellite absorbs sunlight and is warmed to 50°C. When it passes into the earth’s shadow, the satellite radiates energy to deep space. The temperature of deep space is actually 3 K, as a result of the Big Bang 14 billion years ago, but it is so much colder than the satellite that you can assume a deep-space temperature of 0 K. If the satellite’s emissivity is 0.75, to what temperature, in °C, will it drop during the 45 minutes it takes to move through the earth’s shadow?
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주어진 조건: 50°C, 3 K, 0 K, , in
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Physics for Scientists and Engineers: A Strategic Approach · 5th Edition
저자: Randall D. Knight
출판사: Pearson
단원: Work, Heat, and the First Law of Thermodynamics