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ch4aika [34]
3 years ago
11

A thick oak wall (rho = 545 kg/m3 , Cp = 2385 J/kgK, and k = 0.17 W/mK) initially at 25°C is suddenly exposed to combustion prod

ucts at 800°C. Determine the time of exposure necessary for the surface to reach the ignition temperature of 400°C, assuming the convection heat transfer coefficient between the wall and the products to be 20 W/m2 K. At that time, what is the temperature 1 cm below the surface? (Note: use an appropriate equation for the semi-infinite wall case; compare equations 18.20 and 18.21 in the text).

Engineering
1 answer:
Nimfa-mama [501]3 years ago
8 0

Answer:

Explanation:

The detailed calculation and appropriate equation with substitution is as shown in the attached file.

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Answer:

The correct response will be "0.992". The further explanation to the following question is given below.

Explanation:

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⇒  0.2\times 0.8

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On the third attempt the success probability will be:

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⇒  0.032

So that the success probability will be:

⇒  0.8 + 0.16 + 0.032

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7 0
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A cylindrical 1045 steel bar is subjected to repeated compression-tension stress cycling along its axis. If the load amplitude i
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Answer:

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Explanation:

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<em>attached below is a detailed solution</em>

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