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9. We assume the sense of initial rotation is positive. Then, with
ω
0
= +120 rad/s and
=
0 (since it stops at time
t
), our angular acceleration (‘‘deceleration’’) will be negative
valued:
α
= – 4.0 rad/s
2
.
(a) We apply Eq. 1012 to obtain
t
.
0
2
0 120 rad/s
30 s.
4.0 rad/s
tt
ωω α
−
=+
¡
==
−
(b) And Eq. 1015 gives
3
0
11
(
)
(120 rad/s 0)(30s) 1.8 10 rad.
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 Spring '08
 Any
 Physics, Acceleration

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