What is the moment of inertia of the door about an axis thatpasses through the hinge line of the door?

A professor's office door is 0.95 m wide, 2.2 m high, 4.2 cmthick; has a mass of 28 kg , and pivots on frictionless hinges. A"door closer" is attached to door and the top of the door frame.When the door is open and at rest, the door closer exerts a torqueof 5.2 N?m .

1) What is the moment of inertia of the door about an axis thatpasses through the hinge line of the door?

2) If you let go of the open door, what is its angularacceleration about the hinge line immediately afterward?

 

 

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