A rotating circular platform, with initial angular velocity w, brakes with an angular acceleration a. Make a diagram of the situation and calculate: a) The time it takes to stop completely. b) The acceleration of a point that is at a distance R from the axis of rotation (do not forget that the acceleration is composed of two components: the tangential and the normal). c) The total distance (or arc) traveled by this point. A rotating circular platform, with initial angular velocity w, brakes with an angular acceleration a. Make a diagram of the situation and calculate: a) The time it takes to stop completely. b) The acceleration of a point that is at a distance R from the axis of rotation (do not forget that the acceleration is composed of two components: the tangential and the normal). c) The total distance (or arc) traveled by this point.