AP Physics 1hardmcq1 pt
A hoop (I = mr²) of mass 2.0 kg and radius 0.30 m rolls at 3.0 m/s. Its rotational kinetic energy is
A.9.0 J
B.18 J
C.4.5 J
D.2.0 J
Explanation
Core Concept
ω = v/r = 10 rad/s; Kᵣot = ½(mr²)ω² = ½(2.0)(0.09)(100) = 9.0 J.
Correct Answer
A9.0 J
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