A barge loaded with lumber and iron ore floats in a lock by a dam (a closed pool of water like a big swimming pool).If some of the cargo is thrown overboard,the level of water in the lock will
A)rise.
B)drop.
C)stay the same.
D)rise,provided it is lumber that is thrown overboard.
E)rise,provided it is iron ore that is thrown overboard.

Question

Quizplus · Accepted Answer

The level of water in the lock will stay the same. The amount of water displaced by the barge is equal to the weight of the barge and its cargo, so throwing some of the cargo overboard will not change the amount of water displaced and therefore will not change the water level. The type of cargo thrown overboard is irrelevant in this case.

A Barge Loaded with Lumber and Iron Ore Floats in a Lock