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... how to explain the phenomenon in introductory....
courses. Arguments based on vector calculus can not be used
in such courses;
Can this question be answered without using advanced calculus?
I do not think so.
Those who disagree are challenged to produce a pedagogically
sound explanation for an introductory physics course
Oh yes, they also know
that water will position itself to minimize potential energy. So
why is the energy minimized when two bulges have equal size?