## anonymous 4 years ago The distance between two telephone poles is d = 49.5 m. When a 1.50-kg bird lands on the telephone wire midway between the poles, the wire sags h = 0.210 m. (a) Draw a free-body diagram of the bird. (b) How much tension does the bird produce in the wire? Ignore the weight of the wire.

1. TuringTest

Here's the free-body:|dw:1329359401119:dw|by symmetry both tensions will have the same magnitude. The vertical components of the tensions cancel the force of gravity so the bird is at rest...

2. TuringTest

To find the tension in the wires we note that the vertical components of the tension due to each wire sum to the force of gravity.|dw:1329359587825:dw|$\sum F_y=T_y-F_g=2T\sin\theta-mg=0$solve for tension T.

3. anonymous

How do I find theta?

4. TuringTest

We have a right triangle:|dw:1329363602444:dw|since you know two sides of the triangle you can use an inverse trig function to find theta

5. anonymous

Thanks. Can you help me with another problem?

6. TuringTest

sorry, break time I'll check back later, just post more in the physics section and I'll look for them later

7. anonymous

ok.