Fire Poker

One end of a poker iron is placed in a fire where the temperature is 490 ° C, and the other end is maintained at a temperature of 25 ° C. Poker is 1.2 m long and has a radius of 5.0 m. 10-3 Ignoring the heat lost along the poker, find the amount of heat conducted from one end to another poker in 6.0 s.

thermal conductivity of iron is 80 W / mK
power = K x A x DELTA.T / thickness
Area = Ïer ² = Ïe (0.005) ² = 0.0000785 m

P = 80 W / mK x (490-25) x (0.0000785 m) / (1.2 m)
P = 2.43 watts or 2.43 J / s

SX 6s 2.43 J / = 14.5 Joules.

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