Physics
Explain why an iron needle sinks in water, but a ship made of iron floats on water.
Answer
An iron needle is solid and density of iron is more than that of water. Weight of iron needle is more than the buoyant force of water on it so it sinks in water. Although ship is made of iron but it has hollow space that is filled with air which make its average density less than that of water, so ship floats on water.
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