AP Physics 1hardmcq1 pt
A solid disk (I = ½mr²) of mass 4.0 kg and radius 0.50 m rolls at 2.0 m/s. Its rotational kinetic energy is
A.2.0 J
B.4.0 J
C.8.0 J
D.1.0 J
Explanation
Core Concept
Kᵣot = ½Iω² with ω = v/r = 4.0 rad/s and I = ½(4.0)(0.25) = 0.50 kg·m², giving ½(0.50)(16) = 4.0 J.
Correct Answer
B4.0 J
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