Five objects (shown below) have equal mass m=1.6 kg and equal radius R=8.8 cm. They are free to rotate about the axis indicated by the grey line.

4a The object with the smallest moment of inertia is rotating at an angular velocity of ω=7.2 rad/s. At what angular velocity would the object with the largest moment of inertia need to rotate to have the same rotational energy? Give your answer in rad/s.

 

R R R R R Solid cylinder Cylindrical shell Solid sphere Spherical shell Thin rod (about its center)