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Ce are multa energie potentiala elastica: un resort cu100N/m comprimat cu 0,5cm sau unul cu 50N/m' comprimat cu 1cm

Răspuns :

K1=100N/m        
Dl1=0,5cm=0.005m                            
--------------------------------
K2=50N/m
Dx=1cm=0.01m
Epel1=[tex] \frac{K1Dx1^{2} }{2} [/tex]=100·0.000025/2=0.00125J
Epel2=K2·[tex] Dl2^{2} [/tex] / 2= 50·0.01/2=0,25
Epel1<Epel2