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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
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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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