While loaded as shown in the DEEP DRILLER Sample Load Form #4 (Drilling), all of the liquid mud is dumped. What is the new longitudinal free surface correction?
Official USCG Answer & Rule Citation
Correct Answer: Option C — 1.67 feet
Free surface corrections depend on the moment of inertia of the tank's free surface area divided by the total displacement. Removing liquid mud alters the remaining slack tanks and free surface moments, yielding a new longitudinal free surface correction of 1.67 feet per stability manual calculations.
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