Quiz 8A - Week 3

1. Transverse statical stability is the:

• • Ability to steer in strong wind

• • Motion in longitudinal rolling

• • Ability to return to upright

• • Waterplane area when trimmed

2. When the ship heels, G and B:

• • Stay in original positions

• • Reverse their locations

• • Shift and create a moment arm

• • Align to roll the vessel

3. Righting lever (GZ) is the:

• • Vertical force at metacenter

• • Weight moment from fore to aft

• • Horizontal distance G to Bf

• • Vertical line from mast to keel

4. As heel increases, GZ:

• • Increases then vanishes

• • Increases, peaks, then drops

• • Stays constant at all angles

• • Always equals KM minus KG

5. The GZ curve plots:

• • Righting lever vs heel angle

• • Buoyancy force vs gravity

• • GM vs displacement

• • Draft vs waterline beam

6. Righting moment is calculated by:

• • KM minus G multiplied by heel

• • GZ multiplied by displacement

• • KB divided by GM

• • Length over beam ratio

7. The unit of righting moment is:

• • Meters per second

• • Tons-meters

• • Kilograms per draft

• • Pounds per foot run

8. When the ship is upright and still:

• • There is maximum rolling

• • GZ is highest in value

• • Righting moment is zero

• • GM equals heel angle

9. The intersection of buoyant lines is:

• • Center of gravity

• • Trim point of balance

• • Center of pressure

• • Initial transverse metacenter

10. At small heel angles, M is:

• • Variable with trim

• • Measured by GZ curve

• • Found near rudder post

• • Measured by GZ curve