Are you sure?
I thought it would fall.
( b3th Not shit. Not mod., Thu 29 Dec 2011, 11:24, 1 reply, 14 years ago)

I'm mostly guessing, to be honest, but it would make sense.
The boat itself is displacing a certain amount of water based on how bouyant it is. The anchor will be weighing the boat down to a certain extent, but that will be counteracting by the boat's bouyancy.

Throw the anchor out of the boat and the anchor is now displacing water without any counteracting bouyancy whatsoever. The boat will be lighter and thus displace less water, but it wasn't displacing a full anchor to begin with, so the water level will rise slightly.
( Kroney, Thu 29 Dec 2011, 11:31, Reply)

It strikes me
that relatively speaking, the boat will be more bouyant without the anchor, so will sit higher in the water, so the water line on the boat will appear to go down.

Or is that just lady-logic gibberish?
( b3th Not shit. Not mod., Thu 29 Dec 2011, 11:33, Reply)

The bouyancy of the boat will counteract some of the mass of the anchor
whilst the anchor is in the boat. So the anchor is not displacing the full amount of water that it would if the anchor was in the water.

The water line on the boat is meaningless, it's the water line on the tank that's important.
( Kroney, Thu 29 Dec 2011, 11:43, Reply)