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93. We choose positive coordinate directions so that each is accelerating positively,
which will allow us to set
a
box
=
R
α
(for simplicity, we denote this as
a
). Thus, we choose
downhill positive for the
m
= 2.0 kg box and (as is conventional) counterclockwise for
positive
sense of wheel rotation. Applying Newton’s second law to the box and (in the
form of Eq. 1045) to the wheel, respectively, we arrive at the following two equations
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 Spring '08
 Any
 Physics

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