USCG USCG Safety Deck
Set 1 • Question #21 of 105
Launch Interactive Practice Room The effects of free surface on a vessel's initial stability do NOT depend upon the __________.
A
volume of displacement of the vessel
B
dimensions of the surface of the liquid
C
amount of liquid in slack tanks
✓ Correct Answer
D
specific gravity of the liquid in the tank
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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