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September 20, 2014

September 20, 2014

Posted by **Elise** on Monday, January 17, 2011 at 10:24pm.

- physics -
**bobpursley**, Monday, January 17, 2011 at 11:00pmWoulnt each rafer be supporting 3000N, so the compressive force is given by

cosine60 = 3000/compressive force

and solve for the compressive force. This gives you an idea why in past times flying buttresses were invented...to keep the walls from flying away.

http://www.google.com/images?q=flying+buttresses&oe=utf-8&rls=org.mozilla:en-US:official&client=firefox-a&um=1&ie=UTF-8&source=og&sa=N&hl=en&tab=wi&biw=1219&bih=724

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