Displacement of Anchored Boat

Question:

What happens to the water level in a pool (up, down, or same) when an anchor is thrown out of a boat in it? Does the same happen when a heavy floating object is thrown out?

Answer:

When an anchor is in a boat its entire weight must be supported by the water the boat displaces. When the anchor is taken from the boat and placed in the water, the boat will displace less water. The water displaced by the anchor itself is of course less than its entire weight, otherwise it would float. Therefore the pool level goes down.

If a heavy floating object is removed from the boat and placed in the water, the weight of the displaced water will still equal the weight of both objects. No change in level.

What happens to the water level in a glass when the ice cubes floating in it melt?

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