Truck door
A truck at rest has one door fully open, as shown. The truck accelerates forward at constant rate A, and the door begins to swing shut. The door is uniform and solid, has total mass M, height h, and width w. Neglect air resistance. w A
(a) Find the instantaneous angular velocity of the door about its hinges when it has swung through 90?.
(b) Find the horizontal force on the door when it has swung through 90?.
