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47. (a) We apply conservation of angular momentum:
I
1
ω
1
+
I
2
2
= (
I
1
+
I
2
)
. The
angular speed after coupling is therefore
()
22
11
2 2
12
3.3kg m
450 rev min
6.6kg m
900 rev min
3.3kg m
6.6kg m
750 rev min.
II
ωω
⋅+
⋅
+
==
+⋅
+
⋅
=
(b) In this case, we obtain
3.3 kg m
450 rev/min
6.6 kg m
900 rev/min
3.3 kg m
6.6 kg m
450 rev min
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 Spring '08
 Any
 Physics, Angular Momentum, Momentum

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