This question was put on hold recently, which was reedited and adjusted by myself.
I do not question the decision but would appreciate any discuss on this issue. Also I would like to apply the question to be re-opened.
The question is not a homework (I am not sure whether it is "homework-like"). It is a calculation-oriented question based on fluid physics (I also cited a particular paper) so maybe that qualifies. It is certainly about physics and requests a definite proof or answer.