
Home  Forums  Rules  Articles  The diyAudio Store  Gallery  Blogs  Register  Donations  FAQ  Calendar  Search  Today's Posts  Mark Forums Read  Search 
The Lounge A place to talk about almost anything but politics and religion. 

Please consider donating to help us continue to serve you.
Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving 

Thread Tools  Search this Thread 
1st October 2012, 03:54 PM  #131 
Speakerholic
diyAudio Moderator

Consider the earth to be spherical with a circumference of 40,000 kms. A string, wrapped around the earth, would measure 40,000 kms. Take another string and raise it 1 cm from the first and go around the earth again. How much longer is the second string?

1st October 2012, 05:48 PM  #132 
diyAudio Member
Join Date: Mar 2012
Location: Bradford

2πcm

3rd October 2012, 08:56 AM  #133  
diyAudio Member
Join Date: Aug 2006

Quote:
Radius of raised string is (Re + 1cm) length of that string is 2piRe + 2picm therefore difference in strings is (2piRe + 2pi cm  2pi Re)=2pi cm. Good question, very counterintuitive. (check my maths tho haha, the reasoning is correct) Oops, plastic got it first, just realised what looks like an n to me without glasses is prob pi. 

3rd October 2012, 03:15 PM  #134  
diyAudio Member
Join Date: Mar 2012
Location: Bradford

Quote:
It's quite an instructive problem. The relationship between radius and circumference is linear, so simple superposition applies. Counterintuitive perhaps because our conception of the size of a circle is more related to area than to radius or circumference. 

3rd October 2012, 05:24 PM  #135 
Speakerholic
diyAudio Moderator

I think because it's 40,000km, the initial reaction is: It has to be way longer, now let's go find out how much. Hmmm...

3rd October 2012, 05:26 PM  #136 
Speakerholic
diyAudio Moderator


3rd October 2012, 05:48 PM  #137 
Speakerholic
diyAudio Moderator

What occurs once in a minute, twice in a moment, but never in a thousand years?

3rd October 2012, 06:31 PM  #138 
diyAudio Member

"m"
__________________
The Devil is not so terrible as his math model is! 
3rd October 2012, 07:16 PM  #139 
Speakerholic
diyAudio Moderator


3rd October 2012, 07:16 PM  #140  
diyAudio Member
Join Date: Mar 2012
Location: Bradford

Quote:
π That's Palatino. This editor ignores the typeface of imported text, so I changed the font after pasting. 

Thread Tools  Search this Thread 


Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
74HC logic or No logic feedingthe Interface Receiver.  Mario_JR  Digital Source  2  10th July 2011 09:18 PM 
Logic vs. emotion  PeteMcK  The Lounge  381  12th May 2011 07:56 PM 
74AC logic V.S. 74HC logic ?  fastcat95  Digital Source  0  16th December 2006 04:03 PM 
Logic?  Grahamt  MultiWay  3  5th November 2004 01:45 AM 
logic ?  luurmees  Parts  2  9th May 2003 09:05 PM 
New To Site?  Need Help? 