Insulating materials are rated by their _____. specific heat heat index r-value temperature resistance
2 answers:
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 =
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.
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Answer:
Ro = 133 [kg/m³]
Explanation:
In order to solve this problem, we must apply the definition of density, which is defined as the relationship between mass and volume.
where:
m = mass [kg]
V = volume [m³]
We will convert the units of length to meters and the mass to kilograms.
L = 15 [cm] = 0.15 [m]
t = 2 [mm] = 0.002 [m]
w = 10 [cm] = 0.1 [m]
Now we can find the volume.
And the mass m = 4 [gramm] = 0.004 [kg]
Answer:
=6.5%
Explanation:
Mass of the ball: ]
Initial velocity of the ball:
final velocity of the ball: which is -30/100 of
=
Mass of the bottle:
Initial velocity of the bottle:
final velocity of the bottle: is unknown (to find)
<em>by using conservation momentum, which stated that the initial momentum is equal to the final momentum.</em>
<em /><em />
<em>so since the bottle is at rest firstly, therefore </em><em />
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<em /><em> </em><em>equation 1</em>
so now substitute into equation 1
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<em>collect the like terms</em>
divide both side by
Now substitute
6.5%
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