You are on a supply run to an offshore drilling rig. On board is the cargo listed. What is the height above the main deck of the center of gravity of the cargo?
I. Intermediate drill casing - 10 lengths each 16 inches in diameter. Each length weighs 1.7 long
tons. The center of gravity above the main deck of the casing stow is 1.8 feet.
II. Crated machine parts and assorted pipe fittings - 6 crates stowed two high. Each crate is 4'L X 3.5'W X 3'H. Each crate weighs 840 lbs.
III. 10 each - 55 gallon drums of lube oil stowed on end. Each drum weighs 462 pounds, is 26 inches in diameter and 32 inches high.
IV. Dry stores - 12 containers stowed two high. Each container weighs 0.9 long ton and measures
6'L X 4'W X 3'H.
A. 1.20 feet B. 1.64 feet C. 2.26 feet D. 3.00 feet
I. Intermediate drill casing - 10 lengths each 16 inches in diameter. Each length weighs 1.7 long
tons. The center of gravity above the main deck of the casing stow is 1.8 feet.
II. Crated machine parts and assorted pipe fittings - 6 crates stowed two high. Each crate is 4'L X 3.5'W X 3'H. Each crate weighs 840 lbs.
III. 10 each - 55 gallon drums of lube oil stowed on end. Each drum weighs 462 pounds, is 26 inches in diameter and 32 inches high.
IV. Dry stores - 12 containers stowed two high. Each container weighs 0.9 long ton and measures
6'L X 4'W X 3'H.
A. 1.20 feet B. 1.64 feet C. 2.26 feet D. 3.00 feet
Solve by using "Weighted Average" method.
ReplyDeleteI. 17 tons x 1.8 ft = 30.6 ft-tons
II. 2.25 tons x 3 ft = 6.72 ft-tons
III. 2.0625 tons x 1.33 ft = 2.74 ft-tons
IV. 10.8 tons x 3 ft = 32.4 ft-tons
Total weight = 32.1125 tons
Total Moment = 41.6825 ft-tons
KG = 71.9825/32.1125 = 2.24 ft
"C." is the best answer.