At a certain time instant, the temperature distribution in a long cylindrical fire tube can be represented approximately by the relationT = 650 + 800 r – 4250 r2Where temperature t is in degree Celsius and radius r is in meter. Find the rate of heat flow such that the tube measures: inside radius 25 cm, outside radius 40 cm and length 1.5 m.For the tube materialK = 5.5 W/m Kα = 0.004 m2/hr

At a certain time instant, the temperature distribution in a long cyl

1.	At a certain time instant, the temperature distribution in a long cylindrical fire tube can be represented approximately by the relationT = 650 + 800 r – 4250 r2Where temperature t is in degree Celsius and radius r is in meter. Find the rate of heat flow such that the tube measures: inside radius 25 cm, outside radius 40 cm and length 1.5 m.For the tube materialK = 5.5 W/m Kα = 0.004 m2/hr
A.	3.672 * 10 8 W
B.	3.672 * 10 2 W
C.	3.672 * 10 5 W
D.	– 3.672 * 10 5 W
Answer» E.

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