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52. With counterclockwise positive, the angular acceleration
α
for both masses satisfies
()
22
12
1
2
,
mgL
mgL
I
mL
mL
τα
=−=
=+
by combining Eq. 1045 with Eq. 1039 and
Eq. 1033. Therefore, using SI units,
2
2
2
2
9.8 m/s
0.20 m
0.80 m
8.65 rad/s
(0.20 m)
(0.80 m)
gL L
LL
−
−
==
=
−
++
where the negative sign indicates the system starts turning in the clockwise sense. The
magnitude of the acceleration vector involves no radial component (yet) since it is
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 Spring '08
 Any
 Physics, Acceleration, Mass

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