Two different houses are constructed to look like an old log

Two different houses are constructed to look like an old log style cabin. The first is made out of actual logs and has pine wall support members 5in thick. The second house uses a 0.2mm thick pine indoor siding to produce the look of old log construction. In both houses a wall support is being heated by a bedside radiant heater with a heat flux to the surface of 25 kW/m2. What is the difference in ignition time for the two structural members?

Use Properties of Pine to determine answer:

Critical Heat Flux=16kW/m^2

Tig=390C

k=0.14W/(m K)

p=640 kg/m^3

cp=2850 J/(kg K)

Remember you are looking for the difference in the ignition time. After you have computed the math, please choose the correct answer below.

A. 0.3sec

B. 3 sec

C. 30 sec

D 300 sec

Explain how you got your answer and if it is reasonable.

Solution

The answer of following question is as follows.

The correct answer of the given problem is .3 sec .

I get this answer while solving the problem