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2014-03-09T19:42:58+02:00
2014-03-09T20:34:49+02:00
Δla=?
Fa=50 N                 
Fb=20 N       
Δlb=4cm
  => \frac{Fa}{Δ la} = \frac{Fb}{Δ lb}
 \frac{FaxΔ lb}{Fb} => \frac{50 Nx4cm}{20 N} = se simplifica N cu N => \frac{50·4cm}{20} = \frac{200 cm}{20} =10 cm⇒Δla=10 cm

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