Question 2482 Deck Safety
70% to passYour vessel displaces 869 tons and measures 136'L x33'B. You ship a large wave on the after deck which measures 52'Lx 33'B. The weight of the water is estimated at 52.8 tons. What is the reduction in GM due to free surface before the water drains overboard?
A
4.83 feet
B
5.12 feet
C
5.46 feet
D
5.85 feet
AI Explanation
The correct answer is A) 4.83 feet. The reduction in GM (metacentric height) due to free surface effect is calculated using the formula: Reduction in GM = I / (displacement + weight of water on deck). In this case, the moment of inertia (I) of the water on the deck is 52.8 * (52^3 / 12) = 4,863,360 ton-ft^2. The total displacement, including the weight of the water on the deck, is 869 + 52.8 = 921.8 tons. Plugging these values into the formula, the reduction in GM is 4,863,360 / 921.8 = 4.83 feet. The other answer choices are incorrect because they do not match the calculated value of 4.83 feet.
Related Questions
Q134:A distress frequency used on radiotelephone is _______________.
Q2747:The SS AMERICAN MARINER has on board 6450 tons of cargo with an LCG-FP of 270.8...
Q1580:What are the symptoms of a fractured back?
Q562:Which firefighting method is an example of an indirect attack on a fire?
Q352:If another station sent you the signal "KG", what would this indicate?
Ready to test your knowledge?
Take a Deck Safety Practice ExamOfficial Resources
Pass Your Coast Guard Licensing Exams!
Study offline, track your progress, and simulate real exams with the Coast Guard Exams app