When cork and an iron nail are placed in water, which of them will float or sink ?

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Iron nail will float and cork will sink.

Both of them will float.

Cork will float and iron nail will sink.

Both of them will sink.

answer is A.

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Detailed Solution

The cork floats while the nail sinks.The density of cork is less than the density of water.This means that the upthrust of water on the cork is greater than the weight of the cork. So it floats.

The density of an iron nail is more than the density of water.This means that the upthrust of water on the iron nail is less than the weight of the nail. So it sinks.

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