Two disks are rotating about the same axis. disk a has a moment of inertia of 2.56 kg m2 and an angular velocity of +1.46 rad/s. disk b is rotating with an angular velocity of -7.31 rad/s. the two disks are then linked together without the aid of any external torques, so that they rotate as a single unit with an angular velocity of -4.73 rad/s. the axis of rotation for this unit is the same as that for the separate disks. what is the moment of inertia of disk b? number units the tolerance is +/-2%