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Cel mai inteligent răspuns!
2014-11-17T20:14:07+02:00
G=9.8 N/kg
alungire=10mm=0.01 m
Fe(forta elastica)=K* alungir("triunghi micut"l)=400N/m*0,01m=4N/m
Fe=G=>m=G/g=9,8N/kg/4N/m=2,45 kg
V=0.5 m cubi
desnitatea=m/V=2,45/0.5=4,9KG/m cub

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