Related: Should we have a homework tag?
Currently, our homework policy mentions:
4. Use the homework tag
Use the homework tag on your question, in addition to any other tags that identify the kind of physics involved. This lets answerers know that you're looking for an answer which explains the underlying concepts.
However, the homework tag is not much more than a bookkeeping tool, and is also a meta tag. I stopped applying it a long time ago myself, and I think we probably should get rid of it.