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प्रश्न
Why is it easier to swim in sea water than in river water?
टिप्पणी लिखिए
उत्तर
With smaller portion of man’s body submerged in sea water, the wt. of sea water displaced is equal to the total weight of body.
While to displace the same weight of river water, a larger portion of the body will have to be submerged in water. It is easier for man to swim in sea water.
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