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January 26, 2015

January 26, 2015

Posted by **jr** on Wednesday, July 11, 2012 at 10:33am.

- physics -
**Elena**, Wednesday, July 11, 2012 at 1:12pmYoung's modulus E is defined as:

E = stress/strain = (F/A) / (ΔL/L)

Young's modulus for condrete is E =20-100 Gpa.

ΔL=F•L/A•E=4•m•g•L/π•D²•E,

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