This comes around as a direct result of this question, but I'm sure there will be more questions of a similar nature in the future. As commenters have noted, it sounds like a homework problem, but unless the OP explicitly states that, it's hard to know, unless someone else recognizes it out of a textbook or happens to be in the same class.
There certainly some potential issues as I see it. First, and foremost in my mind, is that if people are asking for answers to problems or questions, there are ethical issues at play; essentially, providing them the answer outright, even if the work is explained, is cheating. Second, there are other resources for students to use when they have homework issues, and they should probably be looking there first. Third, I think the lines defining our scope could suffer. The question I linked is probably more accurately defined as a physics question, but it's a concept that is fundamental to multiple engineering disciplines, and could even be covered in an early engineering class.
On the other hand, there could be little to differentiate between a homework question and a very similar issue encountered by a hobbyist or someone else who might not have taken a full slate of engineering classes. I wouldn't think we want to scare off these people simply for asking questions that were taught to trained engineers. Also, in response to the second point above, those resources are not always helpful or approachable, and in that case, I think it's up to the student to decide where they go for help.
These are just the first issues that come to my mind, but I'd love to hear of any other concerns on either side that others have as we come to a consensus on how to treat these questions.
Edit: Since I first posted this topic, another question has appeared which falls under the category of "copy and paste from the assignment."