Solve this:

Q. A vertical rectangular door with its centre of gravity at O (see Figure) is fixed on two hinges A and B along one vertical length side of the door. The entire weight of the door is supported by the hinge A. Then the free body force diagram for the door ( The arrows indicate the direction of the forces ) is :- 

Dear student,

Because the weight of the door is uniformly distributed, its center of gravity is at its geometric center. The free-body diagram looks like this:


Hence option (2) is correct.
Regards

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