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10. As shown in Fig. 5, A and B are two identical pulleys over which wrapped by
massless ropes. A block of mass M is connected to pulley A and a force F acts on pulley
B. F = mg. The angular accelerations of A and B area and a, we have ( )
(A) a = a
(C) a <a
A
P
M
ke..
Fig. 5
(B) a > a
(D) first a
= ag
then aA <aB
a
a
a
Fig. 6
.9

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