Question

Cele 2 probleme rapid va rog frumoss!!!

Answer 1

241. Din ipoteza stim faptul ca
v=2cm/s si t=6s ⇒Δl=v·t=2cm/s·6s ⇒Δl=12cm(alungirea resortului);
m=1,8kg si g=10N/kg ⇒F=m·g=1,8kg·10N/kg ⇒F=18N;
F=k·Δl ⇒k=18N/12cm ⇒k=1,5N/cm=150N/m(constanta elastica a resortului);
242. Din ipoteza stim ca
m₁=5kg si g=10N/kg ⇒F₁=m₁·g ⇒F₁=50N
m₂=2kg si g=10N/kg ⇒F₂=m₂·g ⇒F₂=20N
Asadar F=|F₂-F₁|=|-30N|=30N de unde obtinem ca
F₁/Δl₁=F/Δl₂ ⇔50N/3cm=30N/Δl₂ ⇒Δl₂=1,8cm.