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11. 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?

11. 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?

Grade:12th pass

1 Answers

Pawan Prajapati
askIITians Faculty 8740 Points
9 months ago
We know that density of cotton is lesser than that of an iron bar. Hence, for same mass of 100 kg, the volume of cotton is greater than that of iron bar. Due to this, while weight in air using a weighing machine, the upthrust due to air is more on cotton and less on iron bar. As a result, true weight and consequently, the true mass of cotton must be greater than that of iron bar. Thus, cotton is heavier than the iron bar.

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