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 1

Answer:

actually they both weighed same,but incase of iron bar,it is a solid body where the molecules are arranged in very close to each other ,so the density is more ,hence ,it weighs more heavier than cotton of same mass.

in another way,specific weight of iron bar is more,compatible to cotton of same mass,specific weight is given by the product of density,acceleration due to gravity and volume.as,density of iron bar is more,specific weight of iron is more than same mass of cotton.

Hope it helps u...

Answer 2

$\huge\mathfrak{{answer}}$

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.