a.Fe= k • delta l ;
Delta l = l1-l0 ;
delta l = 17-12 =5cm (atat s-a alungit resortul)
|F| = |G|;
=> F= 24N
=> k= 24N: 0.05m= 480N/m
b. F=42N
k= 480N/m (din a)
=> delta l = 480 N : 42N/m =aprox. 11.42
=> lungimea= lo+11.42
=12+11.42
= 23.42
nu stiu daca b-ul e bine. astea sunt toate datele la b ?
