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Just for fun A little math, a little brain teaser

#1 User is offline   Lobowolf 

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Posted 2009-June-18, 16:24

For purposes of this question, assume the circumference of the earth at the equator is 25,000 miles (132,000,000 feet). Now assume you have a 25,000-mile long piece of rope wrapped around the earth at the equator, fitting snugly. If you wanted to "float" the rope a foot above the earth (i.e. so that at every point around the globe, the rope was a foot off the ground, just sort of hovering there, like Saturn's rings), how much longer would you need to make the rope?
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#2 User is offline   matmat 

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Posted 2009-June-18, 16:33

:) not that much
Spoiler

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#3 User is offline   mtvesuvius 

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Posted 2009-June-18, 16:35

Long enough for a mathematician to hang himself.
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#4 User is offline   hotShot 

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Posted 2009-June-18, 16:43

mtvesuvius, on Jun 18 2009, 11:35 PM, said:

Long enough for a mathematician to hang himself.

That would not be so easy as you might think.
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#5 User is offline   jdonn 

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Posted 2009-June-18, 16:49

((132,000,000 / pi) + 2) * pi - 132,000,000
=
(2 * pi) feet
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#6 User is offline   Lobowolf 

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Posted 2009-June-18, 16:53

hotShot, on Jun 18 2009, 05:43 PM, said:

mtvesuvius, on Jun 18 2009, 11:35 PM, said:

Long enough for a mathematician to hang himself.

That would not be so easy as you might think.

Did you hear the one about the plastic surgeon who hung himself?
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Call me Desdinova...Eternal Light

C. It's the nexus of the crisis and the origin of storms.

IV: ace 333: pot should be game, idk

e: "Maybe God remembered how cute you were as a carrot."
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#7 User is offline   y66 

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Posted 2009-June-18, 17:19

I don't think you need that assumption about the circumference. You just need to assume the earth is round.

2pi(r+1) - 2pi® = 2pi
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#8 User is offline   Jlall 

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Posted 2009-June-18, 17:19

jdonn, on Jun 18 2009, 05:49 PM, said:

((132,000,000 / pi) + 2) * pi - 132,000,000
=
(2 * pi) feet

Wow I'm impressed Jdonn! I knew matmat was balla but not you :)
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#9 User is offline   crazy4hoop 

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Posted 2009-June-18, 17:20

Lobowolf, on Jun 18 2009, 05:53 PM, said:

hotShot, on Jun 18 2009, 05:43 PM, said:

mtvesuvius, on Jun 18 2009, 11:35 PM, said:

Long enough for a mathematician to hang himself.

That would not be so easy as you might think.

Did you hear the one about the plastic surgeon who hung himself?

Was he a penile enlargement specialist trying to make himself hung?
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#10 User is offline   Lobowolf 

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Posted 2009-June-18, 17:28

crazy4hoop, on Jun 18 2009, 06:20 PM, said:

Lobowolf, on Jun 18 2009, 05:53 PM, said:

hotShot, on Jun 18 2009, 05:43 PM, said:

mtvesuvius, on Jun 18 2009, 11:35 PM, said:

Long enough for a mathematician to hang himself.

That would not be so easy as you might think.

Did you hear the one about the plastic surgeon who hung himself?

Was he a penile enlargement specialist trying to make himself hung?

Well, if he were a suicidal type of dude, he'd've hanged himself. Or shot himself.
1. LSAT tutor for rent.

Call me Desdinova...Eternal Light

C. It's the nexus of the crisis and the origin of storms.

IV: ace 333: pot should be game, idk

e: "Maybe God remembered how cute you were as a carrot."
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#11 User is offline   jdonn 

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Posted 2009-June-18, 18:31

Jlall, on Jun 18 2009, 06:19 PM, said:

jdonn, on Jun 18 2009, 05:49 PM, said:

((132,000,000 / pi) + 2) * pi - 132,000,000
=
(2 * pi) feet

Wow I'm impressed Jdonn! I knew matmat was balla but not you :)

I swear I always thought I was great at math, but so rarely do the forums have a math question I can answer!
Please let me know about any questions or interest or bug reports about GIB.
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#12 User is offline   sheepman 

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Posted 2009-June-18, 18:44

The rope would have to be exactly twice half it's length.
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#13 User is offline   matmat 

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Posted 2009-June-18, 19:02

sheepman, on Jun 18 2009, 07:44 PM, said:

The rope would have to be exactly twice half it's length.

lies! fiction! fabrication!
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