A Disk Whose Rotational Inertia Is 450 Kg∙m² Hangs from a Wire

Multiple Choice

A disk whose rotational inertia is 450 kg∙m² hangs from a wire whose torsion constant is 2300 N∙m/rad.When its angular displacement is −0.23 rad, what is its angular acceleration?

A) 1.0 x 10^-2 rad/s²
B) 4.5 x 10^-2 rad/s²
C) 0.23 rad/s²
D) 0.52 rad/s²
E) 1.2 rad/s²