1. Must the boundaries of a system be physical entities? Could the boundaries be given mathematically? Could matter cross the boundary at one specific point? 2. A system is selected to allow the...

1. Must the boundaries of a system be physical entities? Could the boundaries be given mathematically? Could matter cross the boundary at one specific point?

2. A system is selected to allow the analysis of a real situation. Is it possible, in your opinion, to describe exactly all the aspects of a real situation? Explain in a few words and support your answer with an example.