Răspuns:
x=√3cos10πt+sin10πt=
2[√3/2cos10πt+1/2sin10πt)]=
2[sin60cos10πt+cos60*sin10πt]=
aplici formula
sina*cosb+cosA8sinb=sin(a+b)
=2sin(10πt+π/3)
amplitudinea A=2
b)Faza initiala=π/3
c)W=mω²A²/2
m=10g=0,010Kg
a=2cm=0,02m
W=0,01*(0,02)²*10π²= calculezi tu
Explicație: