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## Homework Statement

A spider builds a web using 4 strands as support.

Strand 1: 21mN [20°E of N]

Strand 2: 16mN [60°E of S]

Strand 3: 18mN [40°W of S]

Determine the force of tension in strand 4 assuming the web is stable.

## Homework Equations

r(cosθ) - N/S components

r(sinθ) - E/W components

The pythagoren theorem might be of use along with equations used in simple trig.

## The Attempt at a Solution

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North-South components:

Strand 1: 19.7mN [N]

Strand 2: 8mN

East-West components:

Strand 1: 7.1mN [E]

Strand 2: 13.9mN [E]

Strand 3: 11.6mN [W]

Other than that I've determined that the direction will be in the North-West segment. I'm just having issues determining the total force acted by the 3 given strands. Any pointers would be much appreciated. :)