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12. We assume the sense of rotation is positive, which (since it starts from rest) means all
quantities (angular displacements, accelerations, etc.) are positivevalued.
(a) The angular acceleration satisfies Eq. 1013:
22
1
25 rad
(5.0 s)
2.0 rad/s .
2
αα
=
¡
=
(b) The average angular velocity is given by Eq. 105:
ω
θ
avg
rad
5.0 s
rad / s.
==
=
Δ
Δ
t
25
50
.
(c) Using Eq. 1012, the instantaneous angular velocity at
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This note was uploaded on 05/17/2011 for the course PHY 2049 taught by Professor Any during the Spring '08 term at University of Florida.
 Spring '08
 Any
 Physics, Acceleration

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