P17_057.PDF

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Chapter 17 - 17.57
57. (a) Centimeters are to be understood as the length unit and seconds as the time unit. Making sure our
(graphing) calculator is in radians mode, we find
2
y
1
0
20 40 60 80 100 120 140 160
x
–1
–2
(b) The previous graph is at t = 0, and this next one is at t =0 . 050 s.
2
y
1
0
20 40 60 80 100 120 140 160
x
–1
–2
And the final one, shown below, is at t =0 . 010 s.
2
y
1
0
20 40 60 80 100 120 140 160
x
–1
–2
(c) These graphs (as well as the discussion in the textbook) make it clear that the wave is traveling in
the
−
x direction.
643284264.001.png

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