In a judo foot-sweep move, you sweep your opponent's left foot out from under him while pulling on his gi (uniform) toward that side. As a result, your opponent rotates around his right foot and onto the mat. Figure 10-67 shows a simplified diagram of your opponent as you face him, with his left foot swept out. The rotational axis is through point O. The gravitational force `vecF_(g)` on him effectively acts at his center of mass, which is a horizontal distance d = 28 cm from point O. His mass is 75 kg, and his rotational inertia about point O is `65kgm^(2)`. What is the magnitude of his initial angular acceleration about point O if your pull `vecF_(a)` on his gi is (a) negligible and (b) horizontal with a magnitude of 300 N and applied at height h = 1.4 m?

Explanation

(a) `~~3.2rad//s^(2)`, (b) `9.6rad//s^(2)`