Answer:
Best example would be Carnot engine. It is possible in theory not in real life.
Explanation:
In real engines, the heat transfers at a sudden change in temperature whereas in a Carnot engine, the temperature remains constant. In our day to day lives, reversible processes can't be carried out and there is no such engine with 100 % efficiency. Thus, the Carnot cycle is practically not possible.
the correct answer was African Union
Europeans still ship goods using canals and rivers because it is cheaper than using other shiping methods
Answer: B.) (City A is on a coast while city B is in the middle of a continent.)
Explanation:
