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4 years ago

Insulating materials are rated by their _____. specific heat heat index r-value temperature resistance

Physics

2 answers:

jeka57 [31]4 years ago

4 0

Answer: Option (c) is the correct answer.

Explanation:

The difference in temperature when per unit of heat flux is required by one unit of heat flux between a barrier of warmer and colder surface present in steady state condition is known as R-value.

Mathematically, R-value = $\frac{\text{Temperature difference}\times \text{Area}\times \text{Time}}{Heat loss}$

Thermal resistance of insulating products or materials can be known with the help of R-value. As more is the r-value of a substance more will be its insulating power.

Therefore, we can conclude that insulating materials are rated by their r-value.

Leokris [45]4 years ago

3 0

That would be the R-value

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3 years ago

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Answer:

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Answer:

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3 years ago

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Elan Coil [88]

Answer:

$\text{Vector product}=172.66\ m^2$

Explanation:

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The magnitude of vector B, $|B|=16\ m$

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The formula for the scalar product is given by :

$A{\cdot} B=|A||B|\cos\theta$

Where, $\theta$ is the angle between A and B.

$\cos\theta=\dfrac{116}{13\times 16}\\\\\theta=\cos^{-1}\left(0.5576\right)\\\\\theta=56.11^{\circ}$

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3 years ago

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