A semisubmersible 300 feet long and an LCF...

Question 1 of 2707066636ee728f7522a1c51887c

A semisubmersible 300 feet long and an LCF of 0 (amidships) is in transit with hulls awash and an MT1" of 87.67 foot-tons. Work on the BOP (weight 263 long tons) requires that it be moved aft 12 feet. What is the resulting trim change?

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Question 1 of 27070

🔍 Key Concepts

• Trim = Moment / MT1" relationship for longitudinal weight shifts • How to calculate a trimming moment when a weight is moved fore or aft • The effect of vessel length (300 ft) when converting a trim in inches to feet

💭 Think About

• First, how do you compute the trimming moment caused by moving a 263 long ton weight 12 feet aft? What are the units of that moment? • Once you have the trimming moment, how is MT1" (87.67 ft-tons) used to find the total trim in inches? • After you get the total trim in inches, what simple conversion is needed to express the answer in feet, and how does that relate to the multiple-choice options?

✅ Before You Answer

• Be sure to multiply weight × distance moved (in long tons and feet) to get the trimming moment. • Confirm you are dividing the trimming moment by MT1" (in ft-tons per inch) to obtain total trim in inches, not feet. • Convert inches of trim to feet of trim by dividing by 12, then compare carefully with the answer choices.