The moment of inertia of the vertical handle about O is 0.12 slug-ft2. The object B weighs...

The moment of inertia of the vertical handle about O is 0.12 slug-ft2. The object B weighs 15 lb and rests on a smooth surface. The weight of the bar AB is negligible (which means that you can treat the bar as a two-force member). If the person exerts a 0.2-lb horizontal force on the handle 15 in above O. what is the resulting angular acceleration of the handle?