Originally posted by: Woodchuck2000
Originally posted by: Argo
Stays the same. Since the displacement of the brick will be counteracted by decreased displacement of the boat, since it now weighs less by the weight of one brick. Hope this makes sense.
Woah, that was quick
It's the level of the water relative to the shore that I'm concerned with.
My argument is that different conditions apply for bricks with densities <= water compared to bricks with densities > water.
If a 'light' brick is in the boat, the boat displaces water equal to the mass of the boat + mass of the brick. When the brick is chucked overboard, the boat displaces water of equal mass to the boat and the brick displaces water of equal mass to the brick. The water level stays the same,
If a 'heavy' brick is in the boat, the boat displaces water equal to the mass of the boat + mass of the brick. When the brick is chucked, it displaces less than it's own mass - it sinks, displacing a <volume> of water equal to its own. The boat's still displaces its own mass in water but the total displacement decreases so the level goes down.
Does that make sense or am I talking boll*cks?