USCG USCG Safety Deck
Set 1 • Question #3 of 105
Launch Interactive Practice Room What is the reduction in metacentric height due to free surface when a tank 60 feet long and 30 feet wide is partially filled with salt water, and is fitted with a centerline bulkhead? (The vessel has a displacement of 10,000 tons.)
A
0.1 foot
✓ Correct Answer
B
0.8 foot
C
1.0 foot
D
1.2 feet
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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