Question 3417 Deck General

The correct answer is D) 13.9 seconds. When a vessel is operating in 250 feet of water depth and experiencing a 2-degree pitch angle, the single amplitude pitch period should be longer than 13.9 seconds. This is because the natural period of pitch motion is proportional to the square root of the vessel's draft, and in deep water, the period increases as the depth increases. The formula for calculating the pitch period in deep water is approximately 2π√(L/g), where L is the vessel's draft and g is the acceleration due to gravity. For a vessel with a significant draft in 250 feet of water, this calculation results in a pitch period greater than 13.9 seconds. The other answer choices are incorrect because 0.2 seconds and 0.4 seconds are too short for the given water depth and pitch angle, while 4.9 seconds is also too short for the deep-water conditions described in the question.