Answer
The value of the rotational kinetic energy is 9 MJ, which is less than 12 MJ, meaning that the specifications are incorrect.
Work Step by Step
We substitute the equation for the moment of inertia of a ring and the unit conversion for angular velocity into the equation for rotational kinetic energy to find:
$k_{rotational}=\frac{1}{2}I\omega^2$
$k_{rotational}=\frac{1}{2}mr^2\omega^2$
$k_{rotational}=\frac{1}{2}(1.8252)(.195)^2(30,000\times .104)^2$
$k_{rotational}=\fbox{9 MJ}$
