The SS AMERICAN MARINER is ready to load the cargo listed in table ST-0135 below. There is already 6280 tons of cargo on board with a KG of 25.5 feet. Use the white pages of the Stability Data Reference Book to determine the final KG of all the cargo after loading is completed.
• Use the combined center of gravity formula for two or more weights: (KG_{final} = \frac{\sum (W_i \times KG_i)}{\sum W_i}) • From the white pages of the Stability Data Reference Book for the SS AMERICAN MARINER, each hold/deck (e.g., No. 1 Second Deck, No. 4 Tank Top) has a specific KG value per location, not per weight. • You already have an initial cargo weight and KG (6280 tons at KG 25.5 ft); the table in the illustration gives you additional cargo weights to be loaded in specific locations.
• How do you convert the list of cargo weights in each compartment into a total added vertical moment using the KG values from the white pages? • Once you know the total existing moment and the total new moment, how do you combine them to get a single final KG for all cargo? • Looking at the answer choices, should the final KG be slightly higher or lower than 25.5 ft, given which decks (tank top vs. upper decks) are receiving most of the added weight?
• Be sure you have the correct KG value for each specific hold and deck (e.g., No. 4 Second Deck vs. No. 4 Tank Top) from the white pages; mixing these up will change the answer. • Double-check that you sum all the new cargo weights correctly from the table before dividing to find the final KG. • Confirm you are using only cargo weights and cargo KG values (ignore lightship and fuel for this question, since it asks for KG of all cargo only).
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