Aprofessor's office door is 0.99 m wide, 2.2 m high, 4.2 cm thick; has a mass of 27 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 torque of 5.6 n*m. what is the moment of inertia of the door? if you let go of the open door, what is its angular acceleration immediately afterward?

Explanation:

Given:

∵Since the thickness of the door is very less as compared to its other dimensions, therefore we treat it as a rectangular sheet.

We have a relation between mass moment of inertia, torque and angular acceleration as:

explanation: magnetic pole, region at each end of a magnet where the external magnetic field is strongest. the south-seeking pole, or any pole similar to it, is called a south magnetic pole. unlike poles of different magnets attract each other; like poles repel each other.

wire in brush may conduct electricity from cell to drill and vice versa electrc shock possible