Question 252955
In the boat the iron displaces its own weight of water, in the water it displaces its own volume in water. Since its density is much greater than 1, it will displace more water when it is in the boat than when it is in the water. the boat will therefore rise by the loss of weight and the water will drop accordingly, the water will rise by the volume of iron but this is much less and the overall result is a drop in the water level and a very angry lock keeper who wants to know is going to clean it all up so the next boat doesn't hit the iron.