Răspuns:
y=2*10⁻⁻²sin(100πt-π/6)
ωt=100πt=>
ω=100π
dar ω=2π/T=>
100π=2π/T=>
T=100π/2π=50s
f=1/T=1/50=0,02Hz
Amplitudinea=2·10⁻²=0,02
faza initiala=2π-π/6=11π/6
elongatia la momentul initil t=0
y=0,02sin(100π*0-11π/6)=
0,02sin 11π/6=
0,02*(-1/2)= -0,01
Explicație: