Question

you have a bag of cotton and iron bar each indicating a mass of 100kg when measured on a waiting machine in reality one is heavier than other can you say which one is heavier and why

Answer 1

The cotton bag is heavy as it takes more surface area than iron bar and more atmospheric pressure is applied on it due of its surface area.

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Answer 2

The bag of cotton is heavier than the bar of iron. The cotton bag has a larger air thrust than the iron bar. The weighing machine therefore indicates a smaller cotton bag weight than its actual weight.

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