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111. (a) The linear speed of a point on belt 1 is
2
1
(15 cm)(10 rad/s) 1.5 10 cm/s
AA
vr
ω
==
=
×
.
(b) The angular speed of pulley
B
is
15 cm
(10 rad/s) 15 rad/s
10 cm
BB
B
B
r
rr
r
ωω
§·
=
¡
=
¨¸
©¹
.
(c) Since the two pulleys are rigidly attached to each other, the angular speed of pulley
B
′
is the same as that of pulley
B
, i.e.,
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 Spring '08
 Any
 Physics

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