Question

10. Why do objects made of wood or plastic float in
water?
11. Why an iron needle sinks in water, but an iron ship floats in water?
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Answer 1

Answer:

It's because an iron ship is not completely solid. ... So the average density of the ship as a whole is less than the density of water. Therefore immersed portion of the ship displaces water equal to its weight. So the ship floats whereas a sheet of iron is compact and there are no air spaces inside it.

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Answer 2

Answer:

10)Wood, cork, and ice float in water because they are less dense than water. ... However, if you drop an ice cube in the water it will float. It floats because it weighs less than amount of water it would have to push out of the glass if it sank.

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11)It's because an iron ship is not completely solid. ... So the average density of the ship as a whole is less than the density of water. Therefore immersed portion of the ship displaces water equal to its weight. So the ship floats whereas a sheet of iron is compact and there are no air spaces inside.

Explanation:

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