Question 4986 Deck General

The correct answer is C) -253 foot-kips. When 2.0 feet of drill water is transferred from a full drill water tank 23 to an empty drill water tank 6, the vertical moment decreases by 253 foot-kips. This is because the weight of the drill water is being moved downward, resulting in a negative change in the vertical moment (excluding free surface effects). The other options are incorrect because: A) 253 foot-kips is the absolute value of the change, not the actual change. B) 56 foot-kips is incorrect as it does not account for the downward movement of the weight. D) -411 foot-kips is incorrect as it does not correctly calculate the change in vertical moment.