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PLEASE HELP WORTH 40 POINTS CORRECT ANSWER GETS BRAINLIEST!!!!

The temperatures on the inside and outside surface of a wall are 20°C and 5°C respectively. The wall is 8 m wide, 4 m high, and 0.2 m thick. The thermal conductivity is 0.3 W/m•K.

The heat flux through the wall is negative ____ W/m2. Use two significant figures in your answer.

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janaetheanimeweeb

Answer:

720W

Explanation:

k= 0.3 W/m K

ΔT = 20 – 5 = 15 ºC

S = 8 \times 4 = 32 \;m^2S=8×4=32m

2

A = 0.2 m

q = \frac{ΔT}{A/kS} \\ = \frac{15}{0.2/(0.3 \times 32)} \\ = 720 \;Wq=

A/kS

ΔT

​

=

0.2/(0.3×32)

15

​

=720W

Answer: 720 W

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