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>
Explanation:
The area between the speed-time graph f a body and time axis measures the distance travelled by the body
Answer:
f=velocity/wavelength so 89.2hz
Answer:
A. harmful substances in the air, water, or soil
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