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QUESTION

A trap door 120cm by 120cm is kept horizontal by string attached to the midpoint of the side opposite to that containing the hinge. The other end of

A trap door 120cm by 120cm is kept horizontal by string attached to the midpoint of the side opposite to that containing the hinge. The other end of the string is tied to a point 90cm vertically above the hinge. If the trap door's weight is 50N. Calculate the tension in the string and the reaction at the hinge.

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