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13.38:
The equation
)
t
(
cos
φ
ω
θ
+
Θ
=
describes angular SHM. In this problem,
.
0
=
φ
a)
).
cos(
and
)
sin(
2
2
2
t
ω
ω
t
ω
ω
dt
θ
d
dt
dθ
Θ

=
Θ

=
b)
When the angular displacement is
)
cos(
,
t
ω
Θ
=
Θ
Θ
, and this occurs at
,
0
=
t
so
1.
cos(0)
since
,
and
0,
sin(0)
since
0
2
2
2
=

=
=
=
Θ
ω
dt
θ
d
dt
dθ
When the angular displacement is
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