1. The problem statement, all variables and given/known data A large barge filled with scrap iron is in a canal lock. If the iron is thrown overboard, does the water level at the side of the lock, rise, fall, or remain unchanged? 2. Relevant equations None. I like math a lot but this class i'm taking is a prerequisite to college physics. I enjoy the class though because I do believe that the fundamental conceptual understanding this class provides for physics is great. 3. The attempt at a solution I think the water level will remain unchanged. I draw this conclusion because as the iron is thrown in the water it displaces an amount of water equal to the mass of the iron. But as this happens the boats weight is reduced so it displaces less water because of the decrease in weight. So with all said and done there should be no change. Thanks for the help.