Calculati energia urmatoarelor corpuri:
• o minge de masa m=500g aflata la h=7 m
• un resort de K=400N/m comprimat cu delta l=5 cm
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Răspuns:
m=500g=0.5kg
h=7m
Epg(energie potentiala a greutati)=m×g×h
Epg= 0.5kg×10N/kg×7m=35J
K=400N/m
Δl=5cm=0.05m
Epe(energie potentiala a fortei elastice)= K×Δl²/2
Epe=400N/m×0.05m/2 =10J
Explicație:
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