Raaaid with your 50% density example, the CoG of the object is goung to be on the waterline, as you state. The centre of buoyancy however is going to be half way down the immersed section - and as such at different levels in the two examples. The energy for the move comes from the centre of gravity of the displaced water being lower in the case where the object is floating horizontally.
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Last edited by AndyJWest; 10-09-2011 at 02:52 PM.
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