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2014-06-03T00:17:47+07:00
A. E =  \frac{F . Lo}{A . Δl}
 \frac{F}{Δl}  \frac{E . A}{Lo}
 \frac{F}{Δl} =  \frac{2 . 10^11 . 8 . 10^-6}{0,4}
 \frac{F}{l} =  \frac{16 . 10^5}{0,4}
K = 4 . 10^6 N/m
b. Δx = F/K
         =  \frac{200}{4 .  10^{6} }
         = 0,00005 m
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