Lag1989 task 2.40

By rotating horizontal disc at a distance of 10 cm from the axis of rotation of a light inextensible string tied a length of 0.6 m with a small weight on the end. By rotating the thread forms an angle with the vertical. At what distance from the axis of rotation of the disk can be kept small body, put on a disk, if the coefficient of friction of the body on the surface of the disc of 0.25?