🔍 Key Concepts

• Righting lever (GZ) and how it is measured • Difference between metacentric height (GM) and metacentric radius (BM) • Relationship between lines of action of gravity and buoyant force when a vessel is heeled

💭 Think About

• When the ship heels, what actually creates the turning (righting) moment: a distance, an angle, or a point? • Which terms in the options refer to distances between points, and which refer to distances between lines of action of forces? • Visualize a heeled vessel: draw the vertical through the center of gravity and the vertical through the center of buoyancy. Which stability term is the horizontal separation between those two lines?

✅ Before You Answer

• Verify which term is defined as the horizontal distance between the vertical lines of action of gravity and buoyancy at a given angle of heel • Check which options describe vertical distances (like between G, B, and M) and eliminate them • Confirm that the correct choice is associated with the vessel’s righting moment at a specific heel angle