Homework Answers
comparing with standard equation
T = 2 pi /3000 seconds
Sm/3 = Sm cos@
cos@ = 1/3
@ = 70.53 deg
similarly
-Sm/3 = Smcos@
@ = 109.47 deg
d@ = 109.47 - 70.53 = 38.94 deg = 0.216pi radians
As in time T, wave covers 2 pi
2 pi / 0.216 pi = 2 pi / 3000 / dt
4.622 = 2.093 x10^-3/ dt
dt = 0.45 s
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