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IgorLugansk [536]
2 years ago
5

Is reinforcement needed in a retaining wall

Engineering
2 answers:
velikii [3]2 years ago
8 0
Reinforcement means to rebuild. so yeah i guess you need to reinforce a walk
Charra [1.4K]2 years ago
5 0
Yea, bc you’ll need help reestablishing it
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A thick oak wall initially at 25°C is suddenly exposed to gases for which T =800°C and h =20 W/m2.K. Answer the following questi
Schach [20]

Answer:

a) What is the surface temperature, in °C, after 400 s?

   T (0,400 sec) = 800°C

b) Yes, the surface temperature is greater than the ignition temperature of oak (400°C) after 400 s

c) What is the temperature, in °C, 1 mm from the surface after 400 s?

   T (1 mm, 400 sec) = 798.35°C

Explanation:

oak initial Temperature = 25°C = 298 K

oak exposed to gas of temp = 800°C = 1073 K

h = 20 W/m².K

From the book, Oak properties are e=545kg/m³   k=0.19w/m.k   Cp=2385J/kg.k

Assume: Volume = 1 m³, and from energy balance the heat transfer is an unsteady state.

From energy balance: \frac{T - T_{\infty}}{T_i - T_{\infty}} = Exp (\frac{-hA}{evCp})t

Initial temperature wall = T_i

Surface temperature = T

Gas exposed temperature = T_{\infty}

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3 years ago
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This question has to be one of analog quantization size questions and as such, we use the formula

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On applying the formula and substitutiting the values we have

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Q = 10 / 4096

Q = 0.00244 V, or we say, 2.44 mV

6 0
3 years ago
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