in the first lecture mass is proportional to size cubic
my question is : why cubic??
OCW Scholar - Physics I: Classical Mechanics
Stacey Warren - Expert brainly.com
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IMO, if you look at it from a one dimensional and two dimensional standpoint, you start with a point, and let it grow in one dimension becoming a line. The line has no mass, as it has no volume. Then let the line grow in a second dimension becoming a plane. But it still has no mass as it has no volume.
I should probably also add that he is approximating the size of a body as a cube, discarding all the details of arms, legs, etc.
V = L^3
M is proportional to V
so M is proportional to L^3
but I don't understand whta he means by "size"