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netineya [11]
2 years ago
6

3. Low-voltage conductors rarely cause injuries.

Engineering
1 answer:
hram777 [196]2 years ago
8 0
True
the answer to this would be true
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The host at the end of the video claims that ___________ is crucial to his success as a driver. A. Reaction time B. A safe space
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Answer:

answer is C. his seat belt

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Consider a plane composite wall that is composed of two materials of thermal conductivities kA = 0.1 W/m*K and kB = 0.04 W/m*K a
nadya68 [22]

Answer:

q=39.15 W/m²

Explanation:

We know that

Thermal resistance due to conductivity given as

R=L/KA

Thermal resistance due to heat transfer coefficient given as

R=1/hA

Total thermal resistance

R_{th}=\dfrac{L_A}{AK_A}+\dfrac{L_B}{AK_B}+\dfrac{1}{Ah_1}+\dfrac{1}{Ah_2}+\dfrac{1}{Ah_3}

Now by putting the values

R_{th}=\dfrac{0.01}{0.1A}+\dfrac{0.02}{0.04A}+\dfrac{1}{10A}+\dfrac{1}{20A}+\dfrac{1}{0.3A}

R_{th}=4.083/A\ K/W

We know that

Q=ΔT/R

Q=\dfrac{\Delta T}{R_{th}}

Q=A\times \dfrac{200-40}{4.086}

So heat transfer per unit volume is 39.15 W/m²

q=39.15 W/m²

4 0
3 years ago
A cruise missile under test is moving horizontally at Ma =2 in the atmosphere at an elevation of 2000 m (Air temperature is 2 °C
telo118 [61]

Answer: the half-angle "alpha" of the Mach cone = 30⁰

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To calculate the  half-angle "alpha" of the Mach cone.

we say ;

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given that Ma = 2

now we substitute

Sin∝ = 1 / 2

Sin∝ = 0.5

∝ = Sin⁻¹ 0.5

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Therefore, the half-angle "alpha" of the Mach cone is 30⁰

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chemical energy directly

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