Take 15 minutes to prepare this exercise.
Then, if you lack ideas to begin, look at the given clue and start searching for the solution.
A detailed solution is then proposed to you.
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Initially, . decreases by .
Determine the final temperature and the work to provide.
(Hint : consider a low temperature variation on an elementary cycle).
On an elementary cycle :
The provided work is :
In a stage, the second water basin passes its frozen state.
The specific latent heat of water is .
Determine the new final values of and .
Work is :
In a third step, the temperature of the ice is lowered by .
Determine the new final values and .
Reasoning identical to that of the question .