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Jittu from DAV PUBLIC SCHOOL, asked a question
Subject: Science , asked on 27/5/15

which one is heavier 100 kg cotton or 100kg iron ?

freakyanushka... , added an answer, on 16/10/11
5 helpful votes in Science

 100 kg cotton will be heavier.

This is because...

Upthrust acts on both iron and cotton. Cotton has a lower density than that of iron and therefore the upthrust is more whereas upthrust is less on iron compared to cotton.

Now, we know that UPTHRUST= Actual weight-apparent weight

It is given that apparent weight is 100kg in both the causes.

We know upthrust is more on cotton.

Let us suppose upthrust on cotton is 10N

The, 

Upthrust= Actual weight- Apparent weight

10=Actaul weight - 100

110kg=Actual weight of cotton 

Even if the upthrust on iron is 9.9 N

Then, 

Upthrust= Actual weight - Apparent weight

9.9=Actual weight- 100

109.9=Actual weight

PLEASE NOT THAT WE ARE ASSUMING THE MAGNITUDE OF UPTHRUST! :)

Therefore, Cotton is heavier! 

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Crazy From Modern School, added an answer, on 10/3/13

Cotton is heavier. Surely 

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Kamlesh Bhatt , added an answer, on 27/5/15
1 helpful votes in Science
Both weigh the same, 100 kg. So although their densities are different, they will weigh the same. 
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abdulrashed , added an answer, on 4/10/09

both are same because both are of 100 kg each

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Rahil Ahmed From International Indian School, added an answer, on 1/10/09

dude both r same!!! both r 100kg!!!

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Raj Shah From Fr Agnel Multipurpose High School, added an answer, on 30/9/09

both are same

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Akanksha Sharma From Fateh Public School, added an answer, on 1/10/09

iron is heavier

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Kiran Umesh From Chinmaya Vidyalaya, added an answer, on 30/9/09
1 helpful votes in Science

Of course it is 100kg of iron

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