A semisubmersible, while floating level, displaces 25,000 long tons. LCG is 2 feet forward of amidships. Bulk, weighing 300 long tons, is placed in P-tanks located 50 feet aft of amidships. What is the new LCG?
Official USCG Answer & Rule Citation
Correct Answer: Option B — 1.38 feet forward of amidships
New LCG is computed using final moments about amidships. Initial moment is 25,000 tons times 2.0 ft forward (+50,000 ft-tons). Adding 300 tons at 50 ft aft (-15,000 ft-tons) yields +35,000 ft-tons. Dividing by the final displacement of 25,300 long tons results in 1.38 feet forward of amidships.
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