A solid cylinder of radius r1 2.5 cm, length h1 5.0 cm, emissivity 0.85, and temperature

Chapter 18, Problem 58

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A solid cylinder of radius r1 2.5 cm, length h1 5.0 cm, emissivity 0.85, and temperature 30 C is suspended in an environment of temperature 50 C. (a) What is the cylinders net thermal radiation transfer rate P1? (b) If the cylinder is stretched until its radius is r2 0.50 cm, its net thermal radiation transfer rate becomes P2.What is the ratio P2 /P1?

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