Bottom Boat
A person is in a boat in a swimming pool. He throws a rock from the bottom of 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?
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.
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