Exercise 3

Statical stability can be defined as:

• the amount of work required to heel a vessel to a given angle of heel.

• the work done to return a vessel to an upright position when inclined by an external force.

• the range over which the vessel has positive righting levers.

• the amount of work required to resist external forces.

Dynamical stability can be defined as:

• the amount of work required to heel a vessel to a given angle of heel.

• the work done to return a vessel to an upright position when inclined by an external force.

• the range over which the vessel has positive righting levers.

• the amount of work required to resist external forces.

Curves of statical stability indicate:

• the amount of stability a ship has in calm conditions only.

• the maximum tonnage a vessel can safely carry.

• the amount of stability a ship has after allowances have been made for free surface effect.

• the amount of stability the vessel has for a particular condition of loading.

Dynamical stability is represented by:

• a selected area above a curve of statical stability.

• the maximum GZ.

• GZ in metres.

• a selected area under a curve of statical stability.

The maximum GZ is indicated by the:

• the highest point in a curve

• the lowest point in a curve.

• range of stability.

• initial GM.

Curves of statical stability are:

• the same for any condition of loading.

• different only when the vessel is acted on by some external force.

• different for different conditions of loading.

• used only by naval architects.

The angle of vanishing stability is:

• a condition of stable equilibrium.

• the angle of heel where the righting lever returns to zero.

• when the vessel is experiencing maximum GZ.

• Caused by deck edge immersion.