Physics, 30.08.2019 19:20 kobiemajak
Fred has the idea to improve the efficiency of a certain heat engine exploiting a high-temperature reservoir, by using part of its output to run a refrigerator which cools a low-temperature (finite-sized) heat sink to a temperature below the environmental temperature. fiona tells fred that his efforts are futile. who is correct? in particular, what can you say about the overall efficiency of fred's scheme, assuming everything operates reversibly?
Answers: 2
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According to the law of conservation of mass, in a chemical reaction the total starting mass of all the reactants equal the total final mass of all the products. true or false?
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Curious carl calculated the density of a cube to be 4.50 g/cm3. what is the density of the cube in g/l?
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Which statements describe the movement of ocean currents around the globe? check all that apply. strong winds force warm water to sink to the ocean floor. the coriolis effect causes warm and cold water to mix. cool dense water sinks to the ocean floor. warm water replaces cool surface water. wind blowing parallel to the shore causes upwelling of cool water.
Answers: 1
Fred has the idea to improve the efficiency of a certain heat engine exploiting a high-temperature r...
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