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83. The magnitude of torque is the product of the force magnitude and the distance from
the pivot to the line of action of the force. In our case, it is the gravitational force that
passes through the walker’s center of mass. Thus,
.
I
rF
rmg
τα
===
(a) Without the pole, with
2
15 kg m
I
=⋅
, the angular acceleration is
2
2
2
(0.050 m)(70 kg)(9.8 m/s )
2.3 rad/s .
15 kg m
rF
rmg
II
α
==
=
=
⋅
(b) When the walker carries a pole, the torque due to the gravitational force through the
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This note was uploaded on 05/17/2011 for the course PHY 2049 taught by Professor Any during the Spring '08 term at University of Florida.
 Spring '08
 Any
 Physics, Center Of Mass, Force, Mass

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