Question

va rog frumos rezolvati cele 3 exercitii plz!!!

Answer 1

4.
p= 7000 kg/m³
m= 27kg
p=m/v =>v=m/p = 27 kg/7000 kg/m³=0,0038 m³
G=m×g = 27 kg ×10 N/kg = 270 N

5.a)
F=?
∆l=10 cm = 0,1 m
k= 5000 N/m
F= 0,1 m ×5000 N/m =500 N

b)
G=m×g =0,4 kg ×10 N/kg = 4 N
F=∆l×k
4N = ∆l × 5000 N/m
∆l=4N :5000 N/m
∆l=0,0008 m

6.
Forta de frecare este opusa fortei, -F