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You have a bag of cotton and an iron bar...

You have a bag of cotton and an iron bar, each indicating a mass of 100 kg when measured of a weighing machine. In reality, one is heavier than the other. Can you say which one is heavier and why?

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the cotton bag is heavier than the iron bar ,The cotton bag experences larger up thust of air than the iron bar SO , the weighing machine indicates a smaller mass for cotton bag than its actual mass .
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