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Started By
Message
re: Strange-But-True Mathematical brain teasers
Posted on 10/1/16 at 1:49 pm to Powerman
Posted on 10/1/16 at 1:49 pm to Powerman
quote:See my reply to someone who already made this claim.
quote:
Strange-But-True Mathematical brain teasers
This isn't a brain teaser.
It's a simple fricking geometry problem.
1
Posted on 10/1/16 at 2:04 pm to tigerpawl
quote:
2. You have 2 pieces of string. String 1 is 30 inches long and wraps around the sphere at the equator, touching the surface all the way. String 2 is also all the way around at the equator, except String 2 sits 1 foot off the surface all the way around.
ETA: I can't read good
This post was edited on 10/1/16 at 2:06 pm
Posted on 10/1/16 at 2:04 pm to tigerpawl
quote:
No. You're mixing units of measurements. Convert everything to miles or feet and stick with one throughout the entire problem.
No. The post I quoted used the incorrect units and mixed them. I pointed out the error and showed how to correct it (by converting everything to feet).
Posted on 10/1/16 at 2:07 pm to SlapahoeTribe
quote:I stand corrected. I read "should" instead of "would".
No. You're mixing units of measurements. Convert everything to miles or feet and stick with one throughout the entire problem.
No. The post I quoted used the incorrect units and mixed them. I pointed out the error and showed how to correct it (by converting everything to feet).
Posted on 10/1/16 at 2:16 pm to YogaPants
I thought it was "tree fiddy" - now I'm really confused
Posted on 10/1/16 at 2:21 pm to tigerpawl
quote:
tigerpawl
Posted on 10/1/16 at 2:24 pm to tigerpawl
The doctor was the boy's mother
Posted on 10/1/16 at 2:32 pm to TSLG
(no message)
Posted on 10/1/16 at 2:45 pm to tigerpawl
It's 2 pies longer.
Eta:just realized we are on the third page.
Eta:just realized we are on the third page.
This post was edited on 10/1/16 at 2:46 pm
Posted on 10/1/16 at 2:54 pm to tigerpawl
Circumference1 (C) = Pi x Diameter(D)
Circumference2 (C2) = Pi x [Diameter(D) + 1]
C2= 2Pi[D+1] = 2PiD + 2Pi
C2-C1 = 2PiD + 2Pi - 2PiD
C2-C1 = 2Pi
6.283185307179586476925286766559 Ft Approximately
ETA: Messed up the original equation corrected
Circumference2 (C2) = Pi x [Diameter(D) + 1]
C2= 2Pi[D+1] = 2PiD + 2Pi
C2-C1 = 2PiD + 2Pi - 2PiD
C2-C1 = 2Pi
6.283185307179586476925286766559 Ft Approximately
ETA: Messed up the original equation corrected
This post was edited on 10/1/16 at 2:59 pm
Posted on 10/1/16 at 3:57 pm to tigerpawl
quote:
What is the difference in length between String 1 and String 2?
3.14 feet?
ETA: Oops, forgot that diameter increased by two feet (1 foot off the ground on both sides of the earth).
This post was edited on 10/1/16 at 4:00 pm
Posted on 10/1/16 at 4:00 pm to tigerpawl
quote:
basketball (30 inches in circumference).
quote:
Question: What is the difference in length between String 1 and String 2?
Still 6.28 feet, right?
This post was edited on 10/1/16 at 4:01 pm
Posted on 10/1/16 at 4:14 pm to tigerpawl
2*pi feet, but since pi is irrational, the rope can't exist, and this is all just a stupid simulation.
Posted on 10/1/16 at 4:15 pm to upgrayedd
Tree Fiddy
Posted on 10/1/16 at 4:19 pm to tigerpawl
quote:
Separating a constant equation from the scale of the objects involved stymies more than a few.
Indeed.
The length of string 1 is 2pi x r. The length of a string that is 1 foot above that is 2pi x (r+1). So the difference in lengths is:
2pi x (r+1) - (2pi x r)
(2pi x r) + (2pi) - (2pi x r)
2pi
The radius of the sphere doesn't matter.
Posted on 10/1/16 at 4:32 pm to tigerpawl
String 1 is 1 foot from String 2
Posted on 10/1/16 at 4:38 pm to tigerpawl
FIRE ALLEVA!
Posted on 10/1/16 at 4:45 pm to Spock's Eyebrow
quote:
pi is irrational
3.1415wat?
Posted on 10/1/16 at 4:51 pm to tigerpawl
Something like 6 feet longer.
Posted on 10/1/16 at 5:03 pm to tigerpawl
quote:
Question: What is the difference in length between String 1 and String 2?
Zero
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