Question

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 1

Explanation:

We know that true weight = apparent weight + up thrust. The cotton bag is heavier than the iron bar. This is due to the reason, that the bag of cottonwhich has more volume (as it has less density) than the iron bar (which has more density), experiences more up thrust due to air.

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Answer 2

The correct answer is cotton bag is heavier than bag containing iron.

Explanation:

The reason is

True weight = (apparent weight + up thrust)

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 experience more up thrust due to the presence of air.

Therefore in the presence of air the true weight of cotton bag is more compared to the true weight of iron bar.