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And the final one, shown below, is at
t
= 0.010 s.
(c) The wave can be written as
( , )
sin(
)
m
yxt
y
kx
t
ω
=+
, where
/
vk
=
is the speed of
propagation. From the problem statement, we see that
2 / 0.40 5 rad/s
ωπ
π
==
and
2 /80
/ 40 rad/cm
k
ππ
. This yields
2
2.0 10 cm/s 2.0 m/s
v
=×
=
(d) These graphs (as well as the discussion in the textbook) make it clear that the wave is
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 Spring '09
 NAJAFZADEH
 mechanics

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