The DEEP DRILLER is observed to be level at a draft of 60.0 feet. At the same time, the calculated load form shows the displacement to be 17,845 long tons, total longitudinal moment 51,466 foot- kips, and total transverse moments -10,000 foot-kips. What is the transverse location of the missing load?
• Relationship between total transverse moment, displacement, and transverse center of gravity (TCG) • Sign convention for port and starboard moments/offsets (positive vs negative) • How a "missing load" affects the calculated vs observed transverse center of gravity
• First, think about how to compute the transverse center of gravity (TCG) from a given total transverse moment and total displacement. What formula connects these values? • Compare the sign of the total transverse moment with the possible answers. Which choices would be consistent with a negative total transverse moment if starboard is taken as positive? • Ask yourself: if the vessel is observed to be level (no list), where must the actual combined TCG lie relative to the centerline? How does that compare to the TCG implied by the load form, and what does that say about the missing load's transverse location?
• Verify the basic formula: TCG = (Total Transverse Moment) / Displacement, including correct units (foot-kips vs foot-tons). • Check the sign convention: determine which direction (port or starboard) is negative in this problem and keep it consistent throughout your calculation. • Confirm that your final missing-load location both balances the total moment to give zero net list and matches the sign (port/starboard side) implied by the question.
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