Ajutooor. REPEDE. Dau coroana

Răspuns:
V = (10cm)³ = 1000 cm³
d = m/V => m = d×V = 3g/cm³×1000cm³ = 3000 g = 3 kg
Δl = 11 cm - 10 cm = 1 cm = 0,01 m
a)
Fe = G = k×Δl
m×g = k×Δl
Δl = m×g/Δl = 3kg×10N/kg)/(0,01m) = 3000 N/m
b)
G = m×g = 3kg×10N/kg = 30 N
c)
Fe = G = 30 N