Chapter 6.6, Problem 4E

CONCEPTS

Objects A and B are in harmonic motion modeled by $y=3\sin \left(2t-\pi \right)$ and

$y=3\sin \left(2t-\frac{\pi }{2}\right)$. The phase of A is _____________, and the phase of B is __________. The phase difference is ______________, so the objects are moving ______________ (in phase/out of phase).