Question

there are two similar balls, one has a radius of 3cm and weighs 2 kg, second ball has radius of 12cm, how much does it weigh?

Answer 1

you mean similar in density?

Answer 2

I think so the problem doesn't indicate that.

Answer 3

i ask from @pippi3875 !

Answer 4

look if they were similar then they have the same ratio of the radius to the weight
so if you make a ratio :
\[Ball1 (\frac{ r1 }{ m1 }) = Ball2(\frac{ r2 }{ m2 })\]
then you can find m2 very easily

Answer 5

were r=radius , m=mass (weight)

Answer 6

is it clear ?

Answer 7

yes thank you

Answer 8

yw

Answer 9

We can assume they have identical densities, and their mass is proportional to their volume.

when you multiply the radius by 4 (i.e. scaling 3 up to 12)
How much does the volume increase?