inertia l rotating at a constant angular velocily (note that angular velocities use the Greek letter omega and not double-u) around an axis through the center and perpendicular to the plane of the disk (the disk's "primary axis of symmetry") as shown in (Figure 1). The axis of the disk is vertical and the disk is supported by frictionless bearings. The motor of the turntable is off, so there is no external torque being applied to the axis. Review | Constants | Periodic Table Part A What is the final angular velocity, we , of the two disks? Express wr (0mega subscript f) in terms of I, I,, and wi (omega subscript i). Another disk (a record) is dropped onto the first such that it lands coaxially (the axes coincide). The moment of inertia of the record is I. The initial angular velocity of the second disk is zero. > View Available Hint(s) There is friction between the two disks. VO AE After this "rotational collision," the disks will eventually rotate with the same angular velocity Figure ( 1 of 1 Submit Part B Because of friction, rotational kinetic energy is not conserved while the disks' surfaces slip over each other. What is the final rotational kinetic energy, K. of the two spinning disks? Express the final kinetic energy in tems of I, I,, and the initial kinetic energy Kj of the two-disk system. No angular velocities should appear in your answer. View Available Hintis)

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