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Question 2

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

Answer

The bag of cotton is heavier than the iron bar. This is because the density of cotton bag is less than that of the iron bar, so the volume of cotton bag is more compared to iron bar. So the cotton bag experiences more upthrust due to the presence of air.

Actual weight = Measured Weight + Buoyant Force

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