p11_008.pdf

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Chapter 11 - 11.8
8. (a) We assume the sense of rotation is positive. Applying Eq. 11-12, we obtain
ω = ω 0 + αt = ⇒ α = 3000
1200
12 / 60
−
=9000 rev / min 2
.
(b) And Eq. 11-15 gives
2 (1200+3000) 12
2 ( ω 0 + ω ) t = 1
60
which yields θ =420 rev.
θ = 1

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