A quick and rapid motion of a vessel in a seaway indicates:Select the correct response:a small GZa large GMa high center of gravitya low center of gravity
Question
A quick and rapid motion of a vessel in a seaway indicates:
Select the correct response:
- a small GZ
- a large GM
- a high center of gravity
- a low center of gravity
Solution
A quick and rapid motion of a vessel in a seaway indicates a large GM (Metacentric height).
Here's why:
The stability of a ship in water is determined by two factors: the center of gravity and the metacentric height (GM). The center of gravity is the point where the weight of the ship is concentrated. The metacentric height (GM) is a measurement of the initial static stability of a ship.
A large GM indicates that the ship has a strong righting lever, meaning it can quickly return to an upright position after being tilted by waves. This results in a quick and rapid motion in a seaway.
On the other hand, a small GM would result in a slow and rolling motion. The center of gravity doesn't directly affect the speed of the motion, but a high center of gravity can reduce the GM, making the ship less stable.
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