The small block of mass m slides along the radial slot of the disk while the disk rotates in the hori- zontal plane about its center 0. The block is re- leased from rest relative to the disk and moves outward with an increasing velocity along the slot as the disk turns. Determine the expression in terms of r and it for the torque M that must be ap- plied to the disk to maintain a constant angular ve- locity w of the disk.