USCG USCG Safety Deck
Set 1 • Question #4 of 105
Launch Interactive Practice Room The effect of free surface on initial stability depends upon __________.
A
the amount of liquid in the compartment
B
the dimensions of the liquid surface and the vessel's displacement
✓ Correct Answer
C
only the length of the compartment
D
the vertical position of the liquid in the vessel
USCG NMC Regulatory Explanation
The free surface effect of slack liquid in tanks creates a virtual rise in the vessel's center of gravity ($GG' = i / \nabla$), reducing the transverse metacentric height ($GM$) and impairing righting arm ($GZ$) energy.
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