I came to Math and Physics Stack Exchange with a "forum mindset" (partly inherited from Stack Overflow and partly from other math/physics fora), where any problem is welcome, excepting duplicates and do-my-homework questions. I then proceeded to mostly ask questions such as these four: 1, 2, 3, 4. They were problems either connected to projects I worked on or just wonderings.
Such questions are like homework in that they are specific (as opposed to modular - naturally arising in many situations), but, unlike homework, there is not necessarily an easily achievable solution. I asked them because I had no clue how to even approach them. But, since other people are unlikely to wonder about the same setup as I do, the questions will at most serve a pedagogical purpose if some interesting underlying concept is involved.
None of these questions were closed, but now, reading through the homework policy, I am not sure whether such a type of question is welcome. I am asking specifically about Physics SE, using the math questions only to provide more examples of the underlying concept.