Question 4913 Deck General

The correct answer is C) 482 ft-kips. The decrease in vertical moments for the Coastal Driller when 2.5 feet of drill water is discharged from a full drill water tank 23 is 482 ft-kips. This is because the decrease in weight of the drill water (2.5 feet) reduces the vertical moment acting on the vessel, which is calculated by multiplying the change in weight by the vertical distance from the center of gravity to the center of buoyancy. The other options are incorrect because they do not accurately reflect the decrease in vertical moments resulting from the reduction in drill water weight. Options A and B are significantly higher or lower than the correct answer, while option D is too low to be the correct decrease in vertical moments.