Increasing the free surface of a confined liquid has the effect of raising the __________.
Official USCG Answer & Rule Citation
Correct Answer: Option A — virtual height of the center of gravity
Free surface effect occurs when liquids in partially filled tanks shift as the vessel heels. This movement acts as a virtual rise in the center of gravity, effectively reducing the metacentric height. Minimizing free surface is a critical operational requirement for maintaining adequate transverse stability at all times.
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