30 Jul
2018
30 Jul
'18
2:52 p.m.
That's much clearer to me, thanks! The phrase "doesn't move" is presumably with respect to some inertial frame of reference? —Dan Brent Meeker wrote: ----- ... I was imagining a ship that was just a cylindrical tube, that it partly full of some fluid, say oil, and it has a heavy keel. If it rolls, say counter-clockwise looking forward, the oil will stay exactly where it was (neglecting boundary layer friction) while the ship keel will move to the right and upward. Hence the ship structure CG will move to the right, while the oil CG doesn't move. Did that help? -----