A solid cylinder of radius r1 25 centimeter length h1 50, Physics

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A solid cylinder of radius r1 25 centimeter length h1 50

A solid cylinder of radius r1 = 2.5 centimeter, length h1= 5.0 centimeter, emissivity 0.85, and temperature 30^oC is suspended in an environment of temperature 50^oC,

a) Determine the cylinder net thermal radiation transfer rate P1?

b) If the cylinder is stretched until its radius is r2=0.50 centimeter, its net thermal radiation transfer rate becomes P2. Determine what is the ratio of P2/P1?

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