The liquid mud tanks on your vessel measure...

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Question 1 of 2066636eec28f7522a1c51c654

The liquid mud tanks on your vessel measure 18'L by 10'B by 6'D. The vessel's displacement is 944 T and the specific gravity of the mud is 1.9. What is the reduction in GM due to a pair of these tanks (p/s) being slack?

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Question 1 of 20

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🔍 Key Concepts

• Free surface effect and its impact on GM (metacentric height) • Formula for free surface moment (FSM) of a slack transverse tank • Effect of specific gravity (SG) of the liquid on FSM and GM reduction

💭 Think About

• Identify which tank dimension is used for the free surface calculation affecting transverse stability • Recall how to calculate moment of inertia (I) of the free surface area and how it relates to FSM • Think through how having two tanks port and starboard changes the total FSM and thus the GM reduction

✅ Before You Answer

• Make sure you use the correct dimension (breadth) cubed in the free surface formula for transverse stability, not the length or depth • Confirm you adjust the free surface moment for the specific gravity of the mud (1.9) relative to the displacement medium • After calculating total FSM for both tanks, divide by the vessel’s displacement (944 T) to get the reduction in GM, then compare that value to the choices

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