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Sever21 [200]
3 years ago
12

Explain Why must a cooling system do work to transfer thermal energy?

Physics
1 answer:
aleksandrvk [35]3 years ago
8 0
Although internal energy<span> will not spontaneously flow from a cold region to a hot region, it can be forced to do so by doing work on the system.</span>Refrigerators<span> and </span>heat pumps<span> are examples of </span>heat engines<span> which cause energy to be transferred from a cold area to a hot area. Usually this is done with the aid of a </span>phase change<span>, i.e., a refrigerant liquid is forced to evaporate and extract energy from the cold area. Then it is compressed and forced to condense in the hot area, dumping its </span>heat of vaporization<span> into the hot area. ARE YOU FROM K12?</span>
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A ball is dropped from the top of the building.it initially moves at 4.0 m/s after 0.5 seconds it moves at 3.8m/s what force is
Ivahew [28]

The correct answer is

Air resistance

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The effect of the weight is to accelerate the ball, because its direction is the same as the direction of motion of the ball, while the effect of the air resistance is to slow down the ball, because its direction is opposite to that of the motion.

6 0
3 years ago
Instructions
RideAnS [48]
A group of students toured a limestone cave in northwest Georgia.
Which of these best explains how the limestone caves in Georgia were formed?
A. Plant roots split the rock.

B. Acidic water dissolved the rock.

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7 0
2 years ago
Dimensionally, which of the following could be a velocity? *
astra-53 [7]

Answer:

5 meters per second

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5 0
2 years ago
Which statement accurately describes current electricity?
ludmilkaskok [199]
Current electricity is caused by flowing negatively charged particles.
5 0
1 year ago
A 45 kg student runs up a flight of stairs that are 3.2 m high in 2 seconds. How much power did the student use during this time
anastassius [24]
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5 0
2 years ago
Read 2 more answers
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