9.47 A frictionless pulley has
the shape of a uniform solid disk of
mass 2.90 kg and radius 10.0 cm. A
1.60 kg stone is attached to a very
light wire that is wrapped around
the rim of the pulley (Fig. E9.47),
and the system is released from
rest. (a) How far must the stone
fall so that the pulley has 3.30 J of
kinetic energy? (b) What percent
of the total kinetic energy does the
pulley have?
01442m
47.6%
Figure E9.47
T
M
mg
10
A
116
1.50 kg
stone
2.9
2.50 kg
pulley
