Question

Cele incercuite va rog mult

Answer 1

4.

Vectorial: F+N+Ff+G=0

Ox:F-Ff=0

Oy:N-mg=0

F=Ff=20 N

5.b)Δl=25 mm=0,025 m

Fel=kΔl=>k=Fel/Δl=1/0,025=40 N/m

6)G=mg=>m=G/g=27/10=2,7 kg

ρ=m/V=2,7/0,001=2700 kg/m->aluminiu