Chapter 6.6, Problem 38E

To determine

(a)

To find:

The phase of the sine curves $y_1=20\sin 2\left(t-\frac{\pi }{2}\right)$; $y_2=20\sin 2\left(t-\frac{3\pi }{2}\right)$.

To determine

(b)

To find:

The phase difference of the sine curves $y_1=20\sin 2\left(t-\frac{\pi }{2}\right)$; $y_2=20\sin 2\left(t-\frac{3\pi }{2}\right)$.

To determine

(c)

To find:

Whether the curves are in or out of phase.

To determine

(d)

To sketch:

The sine curves $y_1=20\sin 2\left(t-\frac{\pi }{2}\right)$; $y_2=20\sin 2\left(t-\frac{3\pi }{2}\right)$ on the same axes.