A 720-Kg Person Pushes on a Small Doorknob with a Force

Multiple Choice

A 72.0-kg person pushes on a small doorknob with a force of 5.00 N perpendicular to the surface of the door.The doorknob is located 0.800 m from axis of the frictionless hinges of the door.The door begins to rotate with an angular acceleration of 2.00 rad/s².What is the moment of inertia of the door about the hinges?

A) 4.28 kg • m²
B) 7.52 kg • m²
C) 1.88 kg • m²
D) 0.684 kg • m²
E) 2.74 kg • m²