How Does Newton's Second Law Apply to a Bird Sitting on a Wire?

[vkash]

Homework Statement

fill in the blanks.
when a bird of weight W sits on a stretched wire, The tension in the wire is__________

Homework Equations

Force(external)=mass*aceeleration

The Attempt at a Solution

tension should approach to infinity
https://docs.google.com/document/d/1jAxRY0XgAlTG_MBPJJXgmmoBuoqs8og73eew_j0wWmM/edit?hl=en_US

 

[PeterO]

Homework Statement

fill in the blanks.
when a bird of weight W sits on a stretched wire, The tension in the wire is__________

Homework Equations

Force(external)=mass*aceeleration

The Attempt at a Solution

tension should approach to infinity
https://docs.google.com/document/d/1jAxRY0XgAlTG_MBPJJXgmmoBuoqs8og73eew_j0wWmM/edit?hl=en_US

What is your question / difficulty ?

 

[vkash]

What is your question / difficulty ?

is my answer correct.
My answer is infinity.

 

[PeterO]

is my answer correct.
My answer is infinity.

Clearly it can't be. IF the wire was able to be exactly horizontal between the poles, the tension would be infinity - meaning the wire will never be completely horizontal: it will sag slightly [even without the bird]
The fact the wire droops only slightly means the tension is quite large - certainly greater than the weight of the bird.