In the equation x = A cos(ωt+ϕ), where x is displacement, ω is angular frequency, and ϕ is phase angle, the equation is dimensionally consistent if __________.
1
ωt has dimensions of length and ϕ is dimensionless
2
A has dimensions of time and ωt has dimensions of frequency
3
A has dimensions of length and ωt is dimensionless
4
A has dimensions of length and ϕ has dimensions of time