Question

When a bird of weight W sits on a stretched wire, the tension T in the wire is

Answer 1

If the weight of the bird makes the wire bend with each side of the wire making an angel Ф with the vertical.

Then   2 T CosФ = W        = balancing forces in vertical direction.

           T = W / (2 CosФ)  = W/2   if Ф ≈ 0° or very small.


 

Answer 2

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