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Could you model the submarine as a sphere and get accurate values?

how do i calculate the force needed to overcome the friction between a submarine and the water?

i found this equation on the internet 2 × √ ( i/n ×  π  × a) for calculating the gauge of both the primary wire and secondary wire of a flyback converter. i is effective current, and n is number of turns, a is current density, and the article said pick 4 amps per millimeter squared to 8 amps per...