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13.12:
a) From Eq. (13.19),
m.
98
.
0
0
0
=
=
=
m
k
v
ω
v
A
b) Equation (13.18) is
indeterminant, but from Eq. (13.14),
,
2
π
φ
±
=
and from Eq. (13.17), sin

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