The figure below shows two examples of SHM, labeled A and B. (The vertical axis

Question

The figure below shows two examples of SHM, labeled A and B. (The vertical axis is marked in increments of 5 m and the horizontal axis is marked in increments of 0.2 s.)

I need to know how to figure out part (d) the equations for xA and xB in the form of a sine or cosine

What are the following quantities for each SHM?
                                     A        B
(a) the amplitude      12.5 m        17.5 m
(b) the frequency    1.25 Hz       2.5 Hz
(c) the period             0.8 s 0.4 s
(d) Write the equations for xA and xB in the form of a sine or cosine. Use the following as necessary: t, where x is in meters and t is in seconds.
xA = ?
xB = ?

Explanation / Answer

(d) The equation for XA is                      XA = A sin (t + )       The equation for XB is                      XB = A cos (t + )                             XB = A cos (t + )       

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