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

Answer:

Iron is heavier than cotton

Explanation:

Because iron is denser than cotton and hence if we take same volume of cotton and iron,iron would weigh more..

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Answer 2

Answer:

The correct answer is cotton bag is more heavier than iron bar.

Explanation:

The reason is

The reason isTrue weight = (apparent weight + up thrust)

The reason isTrue 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.

The reason isTrue 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.