4. A 3.8 kg cat is standing on a rotating platform of radius of 1.5 m from the center of the platform. Then the operator turns on the ride and brings it up to a rotating rate of one revolution every 4.0 s. a) Identify the net force on the cat. b) Calculate the net force acting on the cat. 0) The cat begins to walk radially outward. He realizes that he begins to slide when he reaches a radius of 2.7 m. Assuming the same rotation rate, calculate the coefcient of static friction between the cat and the rotating platform. (10 pts)