A revolving door consists of four rectangular glass slabs,with the long end of each attached to a pole that acts as the rotation axis. Each slab is 2.60 m tall by 1.40 m wide and has mass 35.5 kg.
A) Find the rotational inertia of the entire door.
B) If it's rotating at one revolution every 12.0 seconds, what's the door's kinetic energy?