The ocean wave period and a vessel's...

Question 1 of 31048fy_heal_CREATE_q112_2027

The ocean wave period and a vessel's apparent rolling period are the same. How is this defined?

Question 1 of 31048

The ocean wave period and a vessel's apparent rolling period are the same. How is this defined?

🔍 Key Concepts

• Resonance between ship and waves: what happens when an external force matches a vessel’s own motion timing • Difference between natural period of roll (ship’s own tendency) and roll caused by external waves • Terminology used when wave period and rolling period line up exactly

💭 Think About

• Ask yourself: when the timing of the waves "locks in" with the ship’s roll and can increase the roll angle, what is that special condition called? • Which option describes a condition of the ship–sea interaction, and which options are just general descriptions of the ship’s own roll characteristics? • Look at the words carefully: which choice is a standard technical term used in stability and seakeeping to describe this matching of periods?

✅ Before You Answer

• Make sure you can distinguish natural rolling period (the ship’s own period in calm water) from the situation when waves drive the motion. • Check which term you’ve seen in textbooks in sections on parametric rolling or resonant rolling in head or following seas. • Eliminate any answers that sound like plain English phrases but are not standard seakeeping terminology.