9.20:
a) Equation (9.7) is solved for
,
0
t
α
ω
ω
z
z
z
-
=
which gives
,
2
z
ave
t
ω
ω
z
α
z
-
=
-
or
.
2
2
1
0
t
α
t
ω
θ
θ
z
z
-
=
-
b)
(
29
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