A small, solid cylinder with mass = 5.0 kg and radius = 0.10 m starts from rest and rotates without friction about a fixed axis through its center of mass. A string is wrapped around the circumference of the cylinder and pulled using a 2.0 N constant force. What's the magnitude of the angular acceleration of the cylinder, in rad/s^2? (The moment of inertia of the cylinder is 1/2MR^2.)