The SS AMERICAN MARINER has on board 6450 tons of cargo with an LCG-FP of 274.46 feet. See table ST-0101 below for the distribution of the cargo to be loaded. Use the white pages of The Stability Data Reference Book to determine the final LCG-FP of the cargo.
• Longitudinal center of gravity (LCG) and how it is calculated using total moments about the forward perpendicular (FP) • Using the existing cargo weight and LCG to find the initial total longitudinal moment • Using table ST-0101 and the white pages to find each compartment’s LCG-FP and compute added moments
• How can you use the initial cargo weight (6450 tons) and its LCG-FP (274.46 ft) to find the ship’s initial longitudinal moment about FP? • Once you know the weight in each compartment from ST-0101, what do you multiply that weight by to get the moment for that compartment, and where do you find that distance? • After summing all weights and all moments (initial plus added), what final calculation gives you the new overall LCG-FP of the cargo, and how will you compare that with the answer choices?
• Be sure you use LCG from the white pages for each specific hold/deck (e.g., No. 1 Second Deck, No. 1 Third Deck, etc.), not some average location. • Verify that the total added cargo weight from ST-0101 is correct before computing moments and that you add it to 6450 tons to get the final total cargo weight. • After computing the final LCG-FP, double-check that your units are feet and that you have divided total moment by total weight before matching to the closest choice.
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