Your vessel is discharging containers from...

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Question 1 of 2066636eec28f7522a1c51d0e5

Your vessel is discharging containers from the main deck with the ship's cranes. Which of the following must be taken into account when calculating the center of gravity as the containers are discharged?

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Question 1 of 20

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🔍 Key Concepts

• Center of gravity (G) of the container itself is at its geometric center • When lifted by the crane, the ship "feels" the load at the point where the weight is effectively acting vertically below the head of the boom • You must think in terms of a vertical distance from the ship’s reference (here, the main deck) to where that container’s weight is acting while it is lifted

💭 Think About

• When the container is suspended, is its weight acting at the heel of the boom, the head of the boom, or somewhere relative to the container itself? • Where is the center of gravity of a rectangular box (like a container): at the top, bottom, or middle? How does that affect the vertical distance you should use? • Which choices correctly combine the ship reference (main deck) with the position of the container’s own center of gravity, rather than just the lifting gear geometry alone?

✅ Before You Answer

• Be sure you are using the center of the container (not its top or bottom) when thinking about its vertical CG location • Confirm that the vertical distance you choose is measured from the main deck to the container’s center of gravity, not just to the boom structure • Eliminate any option that ignores the container’s own height or places the effective weight at the wrong point on the container (e.g., top instead of middle)

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