The disks shown in the figure have equal mass. The second disk has twice the radius of the first, but is spinning with only half the angular velocity. (a) Compare the moment of inertia of the two disks: which is greater, or are they equal? (b) Compare the rotational kinetic energy of the two disks: which is greater, or are they equal? disk1: r=r1 disk2:r=2r1,w2=(1/2)w1