3 Answers

Air trapped in the cavity of the ships hull gives it floatation.

11 years ago. Rating: 5
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Buoyancy, It has to do with mass and surface area of an object.  The ship displaces more water thus will float, the nail only sinks. 

11 years ago. Rating: 4
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good question, Prassna. I always wondered too, how those things float ?  Maybe the hull is stuffed with styra foam  :-\ 

11 years ago. Rating: 1
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