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15.60:
a)
b)
4
3
or
4
No;
c)
).
sin(
π
π
ωt
kx
ωΑ
t
y
=
=
+

=
∂
∂
φ
would both give
.
2
Α
If the
particle is known to be moving downward, the result of part
b) shows that
4.
3
so
and
0,
cos
π
=
<
d) To identify
uniquely, the quadrant in which
is must be
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