The DEEP DRILLER, at 58.0 feet draft in sea water, places 275.8 long tons on board. What is the new draft?
• Displacement and draft relationship – how adding weight changes a vessel’s draft • Tons per inch immersion (TPI) or tons per foot of immersion from hydrostatic data • Unit consistency – long tons, feet, and inches of draft change
• Think about whether adding weight will make the vessel sit deeper or shallower in the water, then compare that with the starting draft. • Estimate how many tons are needed to change the draft by 1 foot or 1 inch, then compare 275.8 LT to that amount. • Use proportional reasoning: if X tons change the draft by Y, then 275.8 tons will change it by how much?
• Confirm whether the draft change should be more than a foot, a few feet, or only a few inches based on a realistic TPI for a large vessel. • Check that your units match: long tons vs. tons per inch/foot; convert inches to feet (or vice versa) before comparing to the answer choices. • Verify that the new draft must be greater than or less than 58.0 feet before choosing among the options.
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