93. We choose positive coordinate directions so that each is accelerating positively, which will allow us to set abox= Rα(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. 10-45) to the wheel, respectively, we arrive at the following two equations
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