A uniform solid disc of mass and radius has a rotational kinetic energy of
PHYSICS · Subjective · AP · Physics 1: Algebra-based · Energy and Momentum of Rotating Systems · Energy and Momentum of Rotating Systems
Problem
A uniform solid disc of mass 2.0kg and radius 0.15m has a rotational kinetic energy of 18J. Calculate the disc’s angular speed. Would a thin hoop of the same mass and radius, but with the same rotational kinetic energy, spin faster or slower? State “faster” or “slower” and briefly justify your answer.