Rotational Dynamics About a Fixed Axis: a 72

Multiple Choice

Rotational dynamics about a fixed axis: 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) 2.00 kg ∙ m²
D) 0.684 kg ∙ m²
E) 2.74 kg ∙ m²