Q1. Physics 1401 problems about rotational motion and angular displacement and angular velocity and angular acceleration about height problems?

Q2. In a judo foot-sweep move, you sweep your opponent's left foot out from under him as pulling on his gi (uniform) toward that side. As a result, your opponent rotates around his right foot and onto the mat. Figure shows a simplified diagram of the opponent as you face him, with his left foot swept out. The rotational axis is throughout point O. The gravitational force on him effectively acts at his center of mass that is a horizontal distance d = 25 cm from point O. His mass is 80 kg, and his rotational inertia about point O is 65 kg·m2. What is the magnitude of his initial angular acceleration about point O if your pull on his gi is (a) negligible and (b) horizontal with the magnitude of 300 N and applied at height h = 1.4 m? Suppose free-fall acceleration to be equal to 9.81 m/s2.