Question

what is the phase shift of h(t)=-2cos(5t-pi/7)

Answer 1

A wave is described by an equation in the form of:

\[y(t) = Acos(\omega t - \phi)\]

where
\[A = Amplitude, \omega = Angular Frequency, \phi = Phase Shift\]

Answer 2

You can also switch in a sin for the cos. The only thing that'll change is the phase shift. But you should be able to pick out the phase shift easily.

Answer 3

it does not do throw in my my homework system

Answer 4

i entered pi/7

Answer 5

do i have change the sign or something???

Answer 6

Oh, I completely blanked on something.

We need to get the function into a slightly different form:

\[y = A \cos (\omega t - \phi) \rightarrow A \cos(\omega(t - \frac{\phi}{\omega}))\]

Your phase shift would then be phi/omega

Answer 7

thank you i got it