Question 4859 Deck General

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A semisubmersible with a displacement of 20,000 tons and KG of 52 feet discharges 300 long tons of barite from P-tanks located 120 feet above the keel. Ballast added to maintain draft has a VCG of 20 feet. What is the change in KG?

A 0.49 foot increase
B 0.50 foot decrease
C 1.50 feet decrease
D 1.80 feet decrease
AI Explanation

The correct answer is C) 1.50 feet decrease. To explain this: 1. Discharging 300 long tons of barite from a height of 120 feet above the keel will lower the overall center of gravity (KG) of the semisubmersible. The decrease in KG can be calculated using the formula: Change in KG = (weight of discharged barite * height of discharge) / total displacement. 2. Plugging in the given values, the change in KG is (300 * 120) / 20,000 = 1.50 feet decrease. 3. The other answer choices are incorrect because they do not accurately reflect the 1.50 feet decrease in KG resulting from the discharge of the barite.

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