Question

If cotton and iron together are placed in a vacuum then what would be the difference b/w the weight of both the objects....there would be any difference or not ... .??

Answer 1

yes there will be a difference as the weight depends upon gravity if there is gravity then there will be difference if there is difference in quantity and if there is not gravity then their weight will be 0 kg or else ok
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Answer 2

IF :-
1. Both of these objects have the same mass and *no gravitational pull acts on them*.....then *there will be no difference* in the weight (ie. the weight of both the substance will be 0).
2. Both of these objects have the same mass and *gravitational pull acts on them*.....then *there will be difference* in the weight.
3. (Suppose) Both of these objects have the same mass and r travelling at the speed of light or very close to the speed of light....then there will be difference in the mass as well as weight of those objects.....
:)