a 76.5-kg disk with a radius of 2.56 m that can rotate around a frictionless axle through its center is initially at rest. a force of 192.5 n can be applied to the disk at any radial distance from the axis of rotation, perpendicular to the radial direction in the plane of the disk. at what radial distance should the force be applied to accelerate the disk so that it completes 3.00 revolutions in 6.50 s? [moment of inertia of disk about its axis through center