Posted by **Sean** on Friday, October 26, 2007 at 4:25pm.

The distance between two telephone poles is 50.0 m.

When a 1.00-kg bird lands on the telephone wire midway between the poles, the wire sags 0.200 m.

Draw a free-body diagram of the bird. How much tension does the bird produce in the wire? Ignore the weight of the wire.

What do I do now?

- Calc-Based Physics -
**bobpursley**, Friday, October 26, 2007 at 5:34pm
Look at the triangle formed with the wire and the horizontal, and the bird vertical.

At the bird, the force down is 1/2 mg (we are doing only one side, due to symettry). The other force is tension, along the wire.

Looks like sinSag=1/2 mg/tension and...

tanSag= .2/50

use the second dto find angle Sag, and the first to solve for tension.

- Calc-Based Physics -
**john**, Tuesday, August 4, 2015 at 5:49pm
how much tension the birdroduce in the wire?

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