In my opinion, if a physics question is translated into a proper mathematical question, it is on-topic on MO. However if it is asked as a physics question, it is rather off-topic. The given question on the Mpemba effect simply explains this effect and asks for explanations in terms of mathematical models -- hence it does not provide this translation. Therefore I think it qualifies as a reasonable physics question, but rather not as a mathematical question.

@Francois: Given the outcome of the poll which I think is sufficiently clear, I consider my proposal as rejected.

@EmilJeřábek: I doubt abuse would be a serious concern -- if something is flagged as an error which is no actual error, anyone who can edit the post could remove the flag.

The voting on the original proposal here and on this post differs significantly. -- Is there any difference between the posts which explains this?

@Gerry: Good question. -- On the one hand one could argue to treat it like the other flags (anyone with at least 15 points can flag), and on the other one could argue to treat it like an edit (>= 2000 points to perform it immediately, anyone can make a suggestion subject to approval).

@quid: Obviously yes.

@Francois: O.k. -- I have posted this as a feature request here: meta.mathoverflow.net/questions/1356. -- Feel free to adjust the proposal if you think you can make it more likely to be implemented if you remove or change certain parts.