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Solved: A uniform 300-N trapdoor in a floor is hinged at
Chapter 11, Problem 4E(choose chapter or problem)
Problem 4E
A uniform 300-N trapdoor in a floor is hinged at one side. Find the net upward force needed to begin to open it and the total force exerted on the door by the hinges (a) if the upward force is applied at the center and (b) if the upward force is applied at the center of the edge opposite the hinges.
Questions & Answers
QUESTION:
Problem 4E
A uniform 300-N trapdoor in a floor is hinged at one side. Find the net upward force needed to begin to open it and the total force exerted on the door by the hinges (a) if the upward force is applied at the center and (b) if the upward force is applied at the center of the edge opposite the hinges.
ANSWER:
Solution 4E
(a)
The applied force become equal to the weight of the trapdoor that is