A wheel (radius = 12 cm) is mounted on a frictionless, horizontal axle that is perpendicular to the wheel and passes through the center of mass of the wheel. A light cord wrapped around the wheel supports a 0.40-kg object. If released from rest with the string taut, the object is observed to fall with a downward acceleration of 3.0 m/s2. What is the rotational inertia (of the wheel) about the given axle?
A. 0.023 kg?m2
B. 0.013 kg?m2
C. 0.020 kg?m2
D. 0.016 kg?m2
E. 0.035 kg?m2
Answer: B
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