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pentagon [3]
3 years ago
5

A thermos bottle has two layers, a glass layer and a vacuum layer.

Physics
1 answer:
SIZIF [17.4K]3 years ago
4 0

The vacuum layer is the better thermal insulator

Explanation:

Depending on how they conduct heat, materials can be classified into two types:

  • Thermal conductos: these are materials that are able to transfer heat efficiently. Examples of thermal conductors are metals in general: in fact, when you heat one side of a metal bar, the other end becomes hot very fast; this means that the heat has been transferred very quickly across the metal rod
  • Thermal insulators: these are materials that do not transfer heat well. In general, gases or rarefied substances are better insulators, because the particles are more spread apart, and therefore the heat (which is transferred by conduction through collisions between molecules) is transferred less efficiently, due to the large distance between the particles.

In this sense, vacuum is the best possible insulator. This is because vacuum contains no particles at all, so there cannot be transfer of heat by conduction (because there cannot be collisions between molecules), and therefore, vacuum is the best thermal insulator.

Learn more about heat:

brainly.com/question/3032746

brainly.com/question/4759369

#LearnwithBrainly

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WITCHER [35]

Answer:

Friction between the box and the floor is 25N to the left.

Explanation:

According to Newton's second law of motion, the net force acting on an object is equal to the produce between the object's mass and its acceleration:

F_{net}=ma

where

m is the mass of the object

a is its acceleration

In this problem, we have two forces acting on the object:

- The applied force, F = 25 N, to the right

- The force of friction F_f, opposing the motion of the box, so to the left

So we can write the net force as

F_{net}=F-F_f

Also, we know that the box is moving at constant speed: this means its acceleration is zero, so

a=0

Therefore

F_{net}=0

WHich means:

F-F_f=0

And therefore,

F_f=F=25 N

which means that the force of friction is also 25 N.

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3. what could you do to increase the precision of your measurements? What factors limit the
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Answer:

Use specific tools built specifically for that specific measurement.

Explanation:

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Which type of environmental science career involves collecting information about how human events impact the environment?
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C. environmental engineer
4 0
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Explanation:

The explanation is in the attachment.

7 0
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After an incandescent lamp is turned on, the temperature of its filament rapidly increases from room temperature to its operatin
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Answer: (1) The resistance increases and the current decreases.

Explanation:  

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Hence, when the temperature of the filament increase, the resistance increases and current decreases.

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