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A solid cylinder of radius r1 = 2.4 cm, length h1 = 4.5 cm, emissivity 0.86,...

A solid cylinder of radius r1 = 2.4 cm, length h1 = 4.5 cm, emissivity 0.86, and temperature 34°C is suspended in an environment of temperature 57°C. (a) What is the cylinder's net thermal radiation transfer rate P1? (b) If the cylinder is stretched until its radius is r2 = 0.46 cm, its net thermal radiation transfer rate becomes P2. What is the ratio P2/P1?

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