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sumanmehra01 asked this question on Class IX » Science » Gravitation

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

Of course it is 100kg of iron

Posted by sooraj_u(student), on 30/9/09

both are same

Posted by himmatshah(student), on 30/9/09

iron is heavier

Posted by akanksha.shanu95(student), on 1/10/09

dude both r same!!! both r 100kg!!!

Posted by koolrock(student), on 1/10/09

both are same because both are of 100 kg each

Posted by abdulrashed(student), on 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...(student), on 16/10/11

Cotton is heavier. Surely

Posted by crazygal015...(student), on 10/3/13

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