Some help with math

His Divine Shadow · Post by **His Divine Shadow** » 2002-10-07 03:36pm

How do I calculate the volume of a sphere if I know it's diameter or radius?

And how do I calculate the energy required for vaporization of such an amount(let's say 1m^3) of... say iron?

Post by **Colonel Olrik** » 2002-10-07 03:42pm

His Divine Shadow wrote:How do I calculate the volume of a sphere if I know it's diameter or radius?

4/3*pi*r^3

His Divine Shadow · Post by **His Divine Shadow** » 2002-10-07 03:47pm

Colonel Olrik wrote:
His Divine Shadow wrote:How do I calculate the volume of a sphere if I know it's diameter or radius?
4/3*pi*r^3

Yes thanks, now could you explain that to me?

4/3 means what?
Pi is 3.14
R is radius
^3 is?

Post by **Colonel Olrik** » 2002-10-07 03:59pm

His Divine Shadow wrote: Yes thanks, now could you explain that to me?

4/3 means what?
Pi is 3.14
R is radius
^3 is?

Sorry.. r is the radius of the sphere, r^3 is the cubic power of the radius.

for example, 2^3=2*2*2=8
3^3=3*3*3=27

4^3=4*4*4

4/3 is 4:3=1.333

I'm a bit busy and there are lots of people with large experience in vaporization calculus, but if they don't respond I'll explain it to you tomorrow

GrandMasterTerwynn · Post by **GrandMasterTerwynn** » 2002-10-07 05:51pm

His Divine Shadow wrote:
Colonel Olrik wrote:
His Divine Shadow wrote:How do I calculate the volume of a sphere if I know it's diameter or radius?
4/3*pi*r^3
Yes thanks, now could you explain that to me? :P

4/3 means what?
Pi is 3.14
R is radius
^3 is?

4/3 . . . exactly that. Four thirds, or 1.25.
R^3 = R * R * R

oberon · Post by **oberon** » 2002-10-07 05:57pm

1.25 = 5/4

nyah

also. when he asked "what is it" I thought he was asking something different than mere values. You don't need to know those if you just plug those things into a calculator/computer, likewise the caret ^, the computer will understand that too. But anyway, the whole thing, "what is it" is what happens when you integrate the volume of the sphere from first principles, like say, by the disc method. Fun factoid, if you differentiate with respect to r, you get the surface area, 4pi*r^2. Analogous to circle area and circumference.

Shadow WarChief · Post by **Shadow WarChief** » 2002-10-07 09:06pm

All right here's what I want to know, what is the formula for the surface area of a sphere?

oberon · Post by **oberon** » 2002-10-07 09:08pm

I just TOLD you! Re-read my post

Shadow WarChief · Post by **Shadow WarChief** » 2002-10-07 09:26pm

oberon wrote:I just TOLD you! Re-read my post

All right then allow me to rephrase the question

Canybody give me JUST the formula and not the actual explanation because I'm not a fucking genius?

Post by **Darth Wong** » 2002-10-07 09:29pm

Shadow WarChief wrote:
oberon wrote:I just TOLD you! Re-read my post
All right then allow me to rephrase the question

Canybody give me JUST the formula and not the actual explanation because I'm not a fucking genius?

Surface area of a sphere = 4*pi*r^2

Why don't you try looking this sort of thing up in books? That's what they're for, you know.

Shadow WarChief · Post by **Shadow WarChief** » 2002-10-07 09:37pm

Darth Wong wrote:Surface area of a sphere = 4*pi*r^2

thanks

Darth Wong wrote:Why don't you try looking this sort of thing up in books? That's what they're for, you know.

Yeah I know, but I was looking through this thread when I realized that I didn't know the formula for the surface area of a sphere, so I thought "what the hell" and replied with the question.

HemlockGrey · Post by **HemlockGrey** » 2002-10-07 09:55pm

*whoosh*

oberon · Post by **oberon** » 2002-10-08 07:30pm

So when I post the FORMULA but it's surrounded by a couple words that say what it is and a period, that's too much for you to handle? I feel for you, man. No I don't. Wong is right. There are these magical containers filled with knowledge all the way from beginner to advanced. You find them in the library, and you operate them by opening and looking inside. Maybe you should try opening one of these magical containers, called "books", before you bust out the swear words and curse us for the fact that you're not a genius just because we use a method called "writing", which is how "books" are made.

Durandal · Post by **Durandal** » 2002-10-08 08:38pm

Going by this thread, I'd say that taking and actually understanding basic high school geometry and chemistry is a rarity.

For god's sake, people, take a math course.

Uther · Post by **Uther** » 2002-10-09 01:05am

I can just feel the love in this thread.

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Some help with math

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