🔍 Key Concepts

• Longitudinal moments change when weight is moved fore and aft; the change equals the weight moved times the longitudinal distance moved • Transferring ballast from one tank to another is treated as removing weight from the first location and adding it to the second location • You must use the vessel’s station spacing (distance between numbered frames/stations) to convert station numbers (1S and 10P) into feet of longitudinal separation

💭 Think About

• How do you calculate the change in longitudinal moment when a weight is shifted from one longitudinal position to another? Think in terms of ‘weight × distance moved’. • Are you correctly accounting for the fact that weight is BOTH removed from 1S and added at 10P (i.e., effectively moved the full distance between those two stations)? • Are you using the correct weight of ballast for 2.0 feet of soundings in the specific tanks involved, based on the tank capacity or tons-per-foot-sounding data for those tanks?

✅ Before You Answer

• Confirm the weight of ballast represented by 2.0 ft of sounding in tank 1S AND in tank 10P (if they differ, use the correct value for each). • Confirm the longitudinal distance in feet between the centers of 1S and 10P (convert station/frame numbers to feet). • Double-check the sign and direction of the moment change (is it a decrease or increase, and does your numeric value match one of the choices?).