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

Asked by Jittu(DAV PUBLIC SCHOOL) , on 27/5/15

Of course it is 100kg of iron

Posted by Kiran Umesh(CHINMAYA VIDYALAYA) on 30/9/09

both are same

Posted by Raj Shah(Fr.Agnel Multipurpose High School,Goa) on 30/9/09

iron is heavier

Posted by Akanksha Sharma(FATEH PUBLIC SCHOOL) on 1/10/09

dude both r same!!! both r 100kg!!!

Posted by Rahil Ahmed(INTERNATIONAL INDIAN SCHOOL) on 1/10/09

both are same because both are of 100 kg each

Posted by abdulrashedon 4/10/09

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!

Posted by freakyanushka...on 16/10/11

Cotton is heavier. Surely

Posted by Crazy(MODERN SCHOOL) on 10/3/13

Both weigh the same, 100 kg. So although their densities are different, they will weigh the same.

Posted by Kamlesh Bhatton 27/5/15