AP Physics 1hardmcq1 pt
A solid sphere (I = ⅖mr², m = 1.0 kg, r = 0.50 m) rolls without slipping at 4.0 m/s. Its rotational kinetic energy is
A.3.2 J
B.8.0 J
C.1.6 J
D.6.4 J
Explanation
Core Concept
ω = v/r = 8.0 rad/s; Kᵣot = ½Iω² = ½(⅖)(1.0)(0.25)(64) = 3.2 J.
Correct Answer
A3.2 J
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