Energy transfer from cool part to hot part(q38)

In summary, the answer to the question about how refrigerators work is c. The process involves removing heat from the inside of the fridge and transferring it to the outside, resulting in a cooler temperature inside. This is achieved through the use of a pump, which moves the heat from the food to the warm part of the fridge.
  • #1
jack1234
133
0
For this question:
http://tinyurl.com/3bozr6

the answer is c.

Can anybody kindly explain how this is achieve by refrigerator?
Because according for what I study so far , the energy is transfer from hot part to cool part...
 
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  • #2
jack1234 said:
For this question:
http://tinyurl.com/3bozr6

the answer is c.

Can anybody kindly explain how this is achieve by refrigerator?
Because according for what I study so far , the energy is transfer from hot part to cool part...

you said c, but the answer refrigerator is answer b.

Refrigerators remove heat from the inside of it and pump it to the outside of it, the inside is usually cooler, so when you put your leftovers in it, the fridge pumps the heat from the food out of the 'cool' part (the inside of it) and takes it to the outside of it (the warm part).
 
  • #3


I can explain the concept of energy transfer from a cool part to a hot part in the context of a refrigerator. This may seem counterintuitive, as we typically think of heat flowing from hot to cold, but in a refrigerator, the process is actually reversed.

First, it's important to understand that temperature is a measure of the average kinetic energy of molecules in a substance. In a hot object, the molecules are moving faster and have more energy. In a cool object, the molecules are moving slower and have less energy.

In a refrigerator, the goal is to remove heat from the inside (the cool part) and transfer it to the outside (the hot part). This is achieved through a process called refrigeration, which involves the use of a refrigerant, such as Freon, to absorb heat from one area and release it in another.

The refrigerant is compressed and then expanded, causing it to change from a liquid to a gas and back to a liquid. As it does this, it absorbs heat from the inside of the refrigerator and releases it to the outside. This is how the cool part gets colder and the hot part gets hotter.

So, while it may seem counterintuitive, the process of refrigeration actually involves transferring energy from the cool part to the hot part. This is why the answer to the question is c - energy transfer from cool part to hot part.
 

1. How does energy transfer from a cool part to a hot part?

Energy transfer from a cool part to a hot part occurs through the process of heat transfer. This can happen through three different mechanisms: conduction, convection, and radiation. In each of these mechanisms, energy is transferred from the cooler object to the hotter object until they reach thermal equilibrium.

2. Can energy transfer from a cool part to a hot part violate the laws of thermodynamics?

No, energy transfer from a cool part to a hot part does not violate the laws of thermodynamics. The Second Law of Thermodynamics states that energy will always flow from a higher temperature to a lower temperature, and therefore, energy cannot flow from a cooler object to a hotter object without the input of external energy.

3. What factors affect the rate of energy transfer from a cool part to a hot part?

The rate of energy transfer from a cool part to a hot part is affected by several factors, including the temperature difference between the two objects, the type of material the objects are made of, the surface area of contact between the two objects, and the distance between the two objects.

4. Can energy transfer from a cool part to a hot part be reversed?

Yes, energy transfer from a cool part to a hot part can be reversed. This can occur through the process of refrigeration or by using a heat pump. These processes use external energy to transfer heat from a colder object to a hotter object.

5. What are some real-world examples of energy transfer from a cool part to a hot part?

Some real-world examples of energy transfer from a cool part to a hot part include heat transfer in cooking, where heat is transferred from a cool pot to the hot food, and the Earth's atmosphere, where energy from the Sun is transferred from the cooler upper atmosphere to the warmer surface of the Earth. Another example is a refrigerator, where heat is transferred from the cool interior to the warmer external environment.

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