...boat into the pool. What happens? A person is in a boat in a swimming pool. He throws a rock from the boat
into the pool. What happens to the water level in the pool?
well if he throws the rock from the bottom of the boat would it go through the boat making it sink and causing the water level to rise ? .. im not sure lol . sorry
The water level decreases.
Reason: The volume of water required to support the weight of the rock is greater than the volume of the rock, so when its weight is removed from the boat, it rises in the water. The water moving into the void thus created is effectively taken out of the pool.
Ergo, the WL goes down.
the water level decreases. imagine an extreme situation. suppose you have a very, very dense rock from a planet in another galaxy. imagine this rock is very small, but very very heavy (for example its volume is 10 cm^3 but its weight is 10000 kg). and you have a large pool with a large boat on it. now, you place the rock in that boat. now, because the rock is very heavy, the boat is almost sink, with the water level very high in boat's body. mark the water level in pool's wall. now, you throw the rock into the pool. because a large weight is released, the boat rises, the water level decreases. the water level in pool's wall will be decreased either. put it another way: if the rock is contained in a boat, it can displace large amount of water. but if it is thrown into the pool, it can only displace exactly 10 cm^3. so, the water level decreases.