Boat Submergence and Displacement

Explanation:
When a boat is placed in water, it displaces a certain amount of water. The boat will submerge when the volume of water it displaces is equal to its own weight.

Displacement:
- Displacement refers to the amount of water that is pushed aside or moved by an object when it is placed in a fluid.
- In the case of a boat, when it is placed in water, it displaces a volume of water equal to its own weight.

Archimedes' Principle:
- Archimedes' principle states that the buoyant force acting on an object submerged in a fluid is equal to the weight of the fluid displaced by the object.
- This principle explains why objects float in water or other fluids.
- If the weight of the boat is less than the weight of the water it displaces, the boat will float.
- If the weight of the boat is equal to the weight of the water it displaces, the boat will remain at the water's surface, neither sinking nor floating.
- If the weight of the boat is greater than the weight of the water it displaces, the boat will sink.

Boat Submergence:
- When a boat displaces water equal to its own weight, it means that the weight of the boat is equal to the weight of the water it displaces.
- This condition leads to the boat submerging or sinking.
- The boat sinks because the weight of the boat is greater than the buoyant force exerted on it by the water.

Therefore, the correct answer to the question is option B: weight. The boat will submerge when it displaces water equal to its own weight.