PROBLEM 4 A uniform disk of radius 0.1 m and mass 4 Kg initially at rest, can rotate freely about a fixed horizontal axis coaxial to its axis of symmetry. A light string wrapped around the cylindrical surface of the disk, is connected to a vertically hanging mass m. Assume that the tension of the string is 10 Nt. Find: a) The torque on the disk b) The angular acceleration of the disk c) The linear acceleration of the mass m and its value d) The kinetic energy of the disk after 4 seconds