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equilibrium of 3 force vectors

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Given 3 force vectors as shown in part C (attached file).

With the measured directions for the first and second quadrant forces, and the magnitude of the force measurement along the negative y direction, calculate the theoretical tensions in the cords that are in the first two quadrants (use the summation of x and y components equal zero). Compare each of these theoretical tensions with the measured experimental values using a percent difference.

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