Before watching this video, be sure that you watch part one.

After you think about that for a while, consider some of these questions.

1. What if the boat had a small lifeboat onboard? If you put the lifeboat into the water, would the water level rise, stay the same, or fall?

2. What if you had a large piece of cork that weighed as much as the anchor? If you threw it overboard, would the water level rise, stay the same, or fall?

3. What if you had 100 pounds of water in the boat, and poured that overboard? Would the water level rise, stay the same, or fall?

And for a real challenge:

4. In the original challenge, compared to a point on the ground outside the pool, when you drop the anchor overboard, will the boat's level rise, stay the same, or fall? To answer this, you have to consider what will happen to the water level, what will happen to the boat's level in the water, and which will have the larger effect?