Two very long concentric cylinders of diameters d1 = 0.42 m and d2 = 0.5 m are maintained at uniform temperatures of t1 = 950 k and t2 = 500 k and have emissivities ε1 = 1 and ε2 = 0.55, respectively. determine the net rate of radiation heat transfer between the two cylinders per unit length of the cylinders. (use σ = 5.67 × 10-8)

fanswer:

explanation:

f

the equation above shows how temperature f, measured in degrees fahrenheit, relates to a temperature c, measured in degrees celsius. based on the equation, which of the following must be true?

a temperature increase of 1 degree fahrenheit is equivalent to a temperature increase of

5

9

degree celsius.

a temperature increase of 1 degree celsius is equivalent to a temperature increase of 1.8 degrees fahrenheit.

a temperature increase of

5

9

degree fahrenheit is equivalent to a temperature increase of 1 degree celsius.

a) i only

b) ii only

c) iii only

d) i and ii only