Question 4857 Deck General

The correct answer is B) 1.71 feet downward. To determine the change in KG (Vertical Center of Gravity) when 500 long tons are discharged from a semisubmersible with a displacement of 20,500 long tons and a vertical moment of 1,060,000 foot-long tons, we can use the formula: Change in KG = (Vertical Moment Change) / (Displacement) The vertical moment change is the product of the discharged weight (500 long tons) and the VCG (120 feet). Therefore, the vertical moment change is 500 x 120 = 60,000 foot-long tons. Plugging this into the formula: Change in KG = 60,000 / 20,500 = 1.71 feet downward The other options are incorrect because they do not accurately reflect the change in KG based on the given information.