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15.47:
a)
s,
rad
126
2
Hz,
0
.
20
)
m
80
.
1
(
)
s
m
0
.
36
(
=
=
=
=
λ
=
πf
ω
v
f
m.
rad
49
.
3
2
=
λ
=
=
π
v
ω
k
b)
[
]
.
)
s
rad
126
(
)
m
rad
3.49
(
cos
)
mm
50
.
2
(
)
(
cos
)
,
(
t
x
ωt
kx
A
t
x
y

=

=
c)At
[
]
.
)
s
rad
126
(
cos
)
mm
50
.
2
(
cos
)
,
0
(
,
0
t
ωt
A
t
y
x
=
=
=
From
this form it may be
seen that at
.
0
,
0
,
0
=
=
∂
∂
t
y
t
x
d) At
2
3
4,
3
m
35
.
1
π
kx
x
=
λ
=
=
and
(
29
[
]
.
2
3
cos
,
4
3
ωt
π
A
t
y

=
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