Ok, quick question for the sake of argument... (you can tell I'm not a math/engineer person).

Say the world has 700 million cars, each with a tailpipe of two inches in diameter. How large (area wise - square miles preferably) would the tailpipe be if you combined all of these into one?

3/30/2009 12:03:04 PM

17

3/30/2009 12:03:14 PM

1400 million inches in diameter

3/30/2009 12:04:23 PM

πr²

[Edited on March 30, 2009 at 12:06 PM. Reason : l]

3/30/2009 12:05:08 PM

does not compute.

you give us a linear measurement (diameter) and you want us to give you the surface area of the pipes combined...?

not possible. to answer it, we need to know the area of one pipe.

(and we have to assume all cars have identical tailpipes)

3/30/2009 12:05:13 PM

the plane will take off

3/30/2009 12:05:41 PM

or are you asking the area of the opening?

that can be done.

3/30/2009 12:06:30 PM

how long is each tailpipe?

3/30/2009 12:07:21 PM

700,000,000*pi square inches

[Edited on March 30, 2009 at 12:07 PM. Reason : ,]

3/30/2009 12:07:22 PM

OEPII the area of the opening

3/30/2009 12:08:20 PM

0.54779438401 square mile

3/30/2009 12:08:35 PM

^Beat me to it

3/30/2009 12:09:39 PM

[Edited on March 30, 2009 at 12:09 PM. Reason : fg]

3/30/2009 12:09:51 PM

win?

3/30/2009 12:10:23 PM

e^-1

3/30/2009 12:11:06 PM

He didnt ask for surface area...other wise he would have given you a length...

=700000000*PI()*(0.08333/5280)^2

[Edited on March 30, 2009 at 12:13 PM. Reason : get a real major]

3/30/2009 12:12:18 PM

Quote :

"you give us a linear measurement (diameter) and you want us to give you the surface area of the pipes combined...? not possible. to answer it, we need to know the area of one pipe."

if only there were a formula to relate diameter and area


hmmmmmm.....

[Edited on March 30, 2009 at 12:12 PM. Reason : .]

3/30/2009 12:12:21 PM

That verifies what I got. I had argued with someone who said the diameter was 1.4 billion inches across and thus it had an area of 48,000 miles or something.

[Edited on March 30, 2009 at 12:13 PM. Reason : .]

3/30/2009 12:12:49 PM

of course this excludes the small area in between all the 700MM tailpipes' exterior surfaces

3/30/2009 12:13:16 PM

Hmm. I must be dumb because I am getting 1.720944 sq miles.


is it not

(Pi * 1^2) * 700,000,000 * 2.49097669 × 10-10 ?

[Edited on March 30, 2009 at 12:15 PM. Reason : df]

3/30/2009 12:13:43 PM

700,000,000 * pi for in²

use http://www.onlineconversion.com to convert from in² to mi²

3/30/2009 12:15:04 PM

http://www.google.com/search?hl=en&client=firefox-a&rls=org.mozilla%3Aen-US%3Aofficial&hs=Tmz&q=700000000*pi+square+inches+to+square+miles&btnG=Search

3/30/2009 12:16:03 PM

Radius of 1 pipe = 1 inch

Area of opening of 1 pipe = pi sq inches

Area of opening of 700 mil combined pipes = 700,000,000*pi sq inches

Area in sq feet = 15,271,631

Area in sq yards = 1,696,848

Area in sq miles = 0.548

= a square 0.74 miles on a side

= a circle 0.835 miles in diameter

Quote :

"if only there were a formula to relate diameter and area hmmmmmm....."

if only you knew the meaning of "surface area"


hmmmmmm.....

[Edited on March 30, 2009 at 12:18 PM. Reason : ]

3/30/2009 12:16:59 PM

had the process correct. i just pushed a wrong button on the windows calculator.

3/30/2009 12:17:08 PM

Quote :

"I had argued with someone who said the diameter was 1.4 billion inches across and thus it had an area of 48,000 miles or something."

then you argued with an idiot

3/30/2009 12:17:48 PM

the OP never once said "surface area"

3/30/2009 12:19:31 PM

it was implied by

Quote :

"area wise "

3/30/2009 12:20:40 PM

OEP acted like he thought the OP wanted surface area of a cylindrical tailpipe

3/30/2009 12:21:42 PM

Quote :

"700,000,000 * pi for in² use http://www.onlineconversion.com to convert from in² to mi²"

i hope you people can do it without using a conversion site/table.

yeah, he didn't say surface area, but he did say this:

Quote :

"(you can tell I'm not a math/engineer person)."

and if anybody had any brains, and they were asked "How large -- area wise -- would the tailpipe be", they should think of surface area of the whole object. if you want to know the area of just one face/surface of the object, you should say it explicitly.

^ haha... you still arguing? leave it to those who know.


[Edited on March 30, 2009 at 12:28 PM. Reason : ]

3/30/2009 12:24:28 PM

no, i was explaining the situation to herscules

i knew exactly what the OP meant

math folks can't see the forest for the trees.

[Edited on March 30, 2009 at 12:27 PM. Reason : we ain't talking about rectangular boxes, we're talking about a tailpipe]

[Edited on March 30, 2009 at 12:27 PM. Reason : you will argue with a fucking wall]

3/30/2009 12:26:40 PM

I am not the only one who thought it. Shadowrunner did too, and he is damn smart from what I know.

If I gave you a rectangular box open on one end and said "What is the area of this?", what are you going to give me? The area of the opening, or the area of the whole box?


So what's the difference between a box and a cylinder? Just the shape. The concepts of surface area still apply.



[Edited on March 30, 2009 at 12:29 PM. Reason : ]

3/30/2009 12:27:44 PM

just because i use a quicker tool to convert something doesn't mean i can't do it on my own

this isn't MY math problem, so why waste too much of MY time to do it? plus i wanted to get the answer before anyone else

3/30/2009 12:28:07 PM

google calculator is quickest

3/30/2009 12:29:00 PM

3/30/2009 12:29:34 PM

just because someone can use some common sense and figure out what a person was actually trying to say instead of acting like a pretentious douche does not make them an idiot

3/30/2009 12:32:54 PM

Quote :

"[Edited on March 30, 2009 at 12:27 PM. Reason : you will argue with a fucking wall]"

3/30/2009 12:33:36 PM

Quote :

"(you can tell I'm not a math/engineer person)"

3/30/2009 12:34:46 PM

answer (in square inches)/12/12/5280/5280 = square miles

3/30/2009 12:35:59 PM

A Twinkie thirty-five feet long, weighing approximately six hundred pounds.

3/30/2009 12:37:28 PM

there is no way a plane can take off on a treadmill.

3/30/2009 12:46:52 PM

I bet it would if you attached a 0.5 sq mile tailpipe to it!

3/30/2009 12:47:54 PM

is that surface area or the area of the opening?

be more specific please

3/30/2009 12:49:19 PM

3/30/2009 12:49:51 PM

Quote :

"(you can tell I'm not a math/engineer person)"

3/30/2009 12:50:17 PM

Quote :

"I bet it would if you attached a 0.5 sq mile tailpipe to it!"

[Edited on March 30, 2009 at 12:51 PM. Reason : V that's what i'm saying]

3/30/2009 12:50:46 PM

Quote :

"use http://www.onlineconversion.com to convert from in² to mi²"

or just type the shit into google

in^2 to mile^2 will do it.

3/30/2009 12:50:56 PM

someone already talked about google doing it

3/30/2009 12:58:02 PM

oops

yea, didnt wanna read all that shit lol

3/30/2009 12:59:03 PM

i think it was the post directly beneath mine, with a long link

3/30/2009 12:59:53 PM

the cars do not exist

[Edited on March 30, 2009 at 1:01 PM. Reason : )]

3/30/2009 1:00:16 PM