1. The problem statement, all variables and given/known data Container filled with water is placed on a scale. case #1 Lid is closed. Rock is placed on top of the lid. case #2 Rock is placed inside the water container, it sinks to bottom. Lid is closed. How does the weight (reading on the scale) compare in the two cases? 2. Relevant equations 3. The attempt at a solution I think the weight is the same in the two cases. But I have done some tricky questions involving buoyancy/weight.water level, and sometimes the answer is not so simple. Once I can confirm this answer, I will post some variants of this situation and try to see where my confusion is.