## A question about volume (caution: Mathematics and physics question)?

Ok, I know how to figure the "volume of a sphere" and the surface area of said sphere, now I need to know how to figure how much I need to remove from the outside, to reduce the volume by about 1/2.

I suspect this will NOT reduce the size of the entire sphere by 1/2....at least, that doesn't seem logical to me.

Can anyone explain it so that I (not a mathematician) can understand it?

I suspect this will NOT reduce the size of the entire sphere by 1/2....at least, that doesn't seem logical to me.

Can anyone explain it so that I (not a mathematician) can understand it?

active| newest | oldest^{2}=4) and the volume (cubic) will be octupled, if that's even a word (2^{3}=8).To determine linear proportions from volume, work backwards. To make the volume 1/8 of what it was, the diameter must be halved (cube root of 1/8 is 1/2). To make the volume half of what it was, the volume must be the cube root of 1/2 of the original, about 0.79. So if you start with a sphere of diameter 1", a sphere with diameter .79' will have about half the radius.

The same concept is true for all three-dimensional objects, regardless of shapes.

Now, I know my figuring will have a "grave error" in it. but it will be to his advantage and I suspect that it will STILL not come even close to what this innumerate, supposed mathematician has come up with. LOGIC tells me he's wrong, without even doing the math.

Kelsey probably knows a better answer, but he's slacking off on the forum-answering, apparently. Probably off creating a black hole to eat the solar system or something.

^{11 }years, we STILL don't get a sun that is doubled in size that would consume (another flawed bit of logic) the planets out to Mars.Oooo, in a way I hate pseudo-science, and in a way I like it....it keeps me thinking.... ;-) I have to work from scratch though....not having a heavily mathematical background....I have to figure it out as I go along.

So, I came up with....if 1/2 the volume of mass were removed we'd get a surface area reduction from 6,078,428,661,500 CKM down to 4,801,958,642,585 CKm So, even given his false information, the math still doesn't support his determination.

^{9}= 10,000,000,000 right ?