Solved Problems 3

Solved Problems 3:
In this lecture you will find ten solved examples about the applications of the first law of thermodynamics. As you request these examples are in Arabic language!
I want you to read these examples carefully and find how you should start to solve any thermodynamics question. You can also look to the examples which also solved in your textbook ( Martins).
Please remember all explanations that were mentioned in our lecture about the applications of the first law of thermodynamics. When you want to find the work done on the system or by the system you have to look for the question carefully and you have to look for all the input and also for the required/requireds. You have to ask yourself these two questions before starting:
1- Are there any mathematical relationship between these input and the required/requireds? If yes go ahead and use the mathematical formula directly.
2- Are there any indirect relationship between these input and the required/requireds? If yes, start to find the best way to calculate the required thing which lead you to find the direct relationship.