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2 hours later…
16:37
D1, D2, D3.
D4, D5, D6.
D7, D8, D9.
@XanderHenderson I also do not have the physics expertise, but the question looks like a reasonable one.
 
1 hour later…
17:54
@user21820 I don't disagree that the question looks reasonable. I honestly think that it looks like a good question. I just don't know that it is on-topic here. I wonder if someone with better background could weigh in... I left a comment, though the question is old, so perhaps it won't make any difference.
18:07
[ SmokeDetector | MS ] Few unique characters in body (94): ...........。。。。。。 ✏️ by fraulifang on math.SE

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