A semisubmersible displacing 18,000 long...

Question 1 of 2707066636ee728f7522a1c518881

A semisubmersible displacing 18,000 long tons has an LCG 2 feet forward of amidships. Bulk, weighing 400 long tons, is discharged from P-tanks located 50.8 feet aft of amidships. What is the new LCG?

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Question 1 of 27070

A semisubmersible displacing 18,000 long tons has an LCG 2 feet forward of amidships. Bulk, weighing 400 long tons, is discharged from P-tanks located 50.8 feet aft of amidships. What is the new LCG?

🔍 Key Concepts

• Longitudinal center of gravity (LCG) and how it shifts when weights are added or removed • How to calculate a moment: weight × distance from a reference (here, amidships) • Effect of removing a weight located aft when the original LCG is forward of amidships

💭 Think About

• What is the ship’s original total longitudinal moment about amidships, given the original displacement and LCG? • When you discharge (remove) the 400 long tons from 50.8 feet aft, what is the sign and value of the moment you are removing? • After removing this weight, what is the new displacement, and how do you find the new LCG from the new total moment and new displacement?

✅ Before You Answer

• Be sure to use the new displacement after discharge when computing the new LCG • Keep a consistent sign convention (e.g., forward moments positive, aft moments negative, or vice versa) and stick with it throughout • Double‑check the units (long tons and feet) and that you are dividing total moment by total displacement for the final LCG