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Three strings, attached to the sides of a rectangular frame, are tied together by a knot as shown in the figure. The magnitude of the tension in the string labeled C is 83.7 N. Calculate the magnitude of the tension in the string marked A.

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T = Tension in A =Tension in B ( for equilibrium in the direction perpendicular to C)

Hence 2T cos 45= Tension in C= 83.7 (The angle between A and B is 90 degrees)

T= 59.18 N

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